<!doctype html><html lang="en">
 <head>
  <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
  <meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
  <title>P3628R0: break label; and continue label;, tl; dr</title>
<style data-fill-with="stylesheet">/******************************************************************************
 *                   Style sheet for the W3C specifications                   *
 *
 * Special classes handled by this style sheet include:
 *
 * Indices
 *   - .toc for the Table of Contents (<ol class="toc">)
 *     + <span class="secno"> for the section numbers
 *   - #toc for the Table of Contents (<nav id="toc">)
 *   - ul.index for Indices (<a href="#ref">term</a><span>, in § N.M</span>)
 *   - table.index for Index Tables (e.g. for properties or elements)
 *
 * Structural Markup
 *   - table.data for general data tables
 *     -> use 'scope' attribute, <colgroup>, <thead>, and <tbody> for best results !
 *     -> use <table class='complex data'> for extra-complex tables
 *     -> use <td class='long'> for paragraph-length cell content
 *     -> use <td class='pre'> when manual line breaks/indentation would help readability
 *   - dl.switch for switch statements
 *   - ol.algorithm for algorithms (helps to visualize nesting)
 *   - .figure and .caption (HTML4) and figure and figcaption (HTML5)
 *     -> .sidefigure for right-floated figures
 *   - ins/del
 *     -> ins/del.c### for candidate and proposed changes (amendments)
 *
 * Code
 *   - pre and code
 *
 * Special Sections
 *   - .note       for informative notes             (div, p, span, aside, details)
 *   - .example    for informative examples          (div, p, pre, span)
 *   - .issue      for issues                        (div, p, span)
 *   - .advisement for loud normative statements     (div, p, strong)
 *   - .annoying-warning for spec obsoletion notices (div, aside, details)
 *   - .correction for "candidate corrections"       (div, aside, details, section)
 *   - .addition   for "candidate additions"         (div, aside, details, section)
 *   - .correction.proposed for "proposed corrections" (div, aside, details, section)
 *   - .addition.proposed   for "proposed additions"   (div, aside, details, section)
 *
 * Definition Boxes
 *   - pre.def   for WebIDL definitions
 *   - table.def for tables that define other entities (e.g. CSS properties)
 *   - dl.def    for definition lists that define other entitles (e.g. HTML elements)
 *
 * Numbering
 *   - .secno for section numbers in .toc and headings (<span class='secno'>3.2</span>)
 *   - .marker for source-inserted example/figure/issue numbers (<span class='marker'>Issue 4</span>)
 *   - ::before styled for CSS-generated issue/example/figure numbers:
 *     -> Documents wishing to use this only need to add
 *        figcaption::before,
 *        .caption::before { content: "Figure "  counter(figure) " ";  }
 *        .example::before { content: "Example " counter(example) " "; }
 *        .issue::before   { content: "Issue "   counter(issue) " ";   }
 *
 * Header Stuff (ignore, just don't conflict with these classes)
 *   - .head for the header
 *   - .copyright for the copyright
 *
 * Outdated warning for old specs
 *
 * Miscellaneous
 *   - .overlarge for things that should be as wide as possible, even if
 *     that overflows the body text area. This can be used on an item or
 *     on its container, depending on the effect desired.
 *     Note that this styling basically doesn't help at all when printing,
 *     since A4 paper isn't much wider than the max-width here.
 *     It's better to design things to fit into a narrower measure if possible.
 *
 *   - js-added ToC jump links (see fixup.js)
 *
 ******************************************************************************/

/* color variables included separately for reliability */

/******************************************************************************/
/*                                    Body                                    */
/******************************************************************************/

	html {
	}

	body {
		counter-reset: example figure issue;

		/* Layout */
		max-width: 50em;			  /* limit line length to 50em for readability   */
		margin: 0 auto;				/* center text within page                    */
		padding: 1.6em 1.5em 2em 50px; /* assume 16px font size for downlevel clients */
		padding: 1.6em 1.5em 2em calc(26px + 1.5em); /* leave space for status flag    */

		/* Typography */
		line-height: 1.5;
		font-family: sans-serif;
		widows: 2;
		orphans: 2;
		word-wrap: break-word;
		overflow-wrap: break-word;
		hyphens: auto;

		color: black;
		color: var(--text);
		background: white top left fixed no-repeat;
		background: var(--bg) top left fixed no-repeat;
		background-size: 25px auto;
	}


/******************************************************************************/
/*                         Front Matter & Navigation                          */
/******************************************************************************/

/** Header ********************************************************************/

	div.head { margin-bottom: 1em; }
	div.head hr { border-style: solid; }

	div.head h1 {
		font-weight: bold;
		margin: 0 0 .1em;
		font-size: 220%;
	}

	div.head h2 { margin-bottom: 1.5em;}

/** W3C Logo ******************************************************************/

	.head .logo {
		float: right;
		margin: 0.4rem 0 0.2rem .4rem;
	}

	.head img[src*="logos/W3C"] {
		display: block;
		border: solid #1a5e9a;
		border: solid var(--logo-bg);
		border-width: .65rem .7rem .6rem;
		border-radius: .4rem;
		background: #1a5e9a;
		background: var(--logo-bg);
		color: white;
		color: var(--logo-text);
		font-weight: bold;
	}

	.head a:hover > img[src*="logos/W3C"],
	.head a:focus > img[src*="logos/W3C"] {
		opacity: .8;
	}

	.head a:active > img[src*="logos/W3C"] {
		background: #c00;
		background: var(--logo-active-bg);
		border-color: #c00;
		border-color: var(--logo-active-bg);
	}

	/* see also additional rules in Link Styling section */

/** Copyright *****************************************************************/

	p.copyright,
	p.copyright small { font-size: small; }

/** Back to Top / ToC Toggle **************************************************/

	@media print {
		#toc-nav {
			display: none;
		}
	}
	@media not print {
		#toc-nav {
			position: fixed;
			z-index: 3;
			bottom: 0; left: 0;
			margin: 0;
			min-width: 1.33em;
			border-top-right-radius: 2rem;
			box-shadow: 0 0 2px;
			font-size: 1.5em;
		}
		#toc-nav > a {
			display: block;
			white-space: nowrap;

			height: 1.33em;
			padding: .1em 0.3em;
			margin: 0;

			box-shadow: 0 0 2px;
			border: none;
			border-top-right-radius: 1.33em;

			color: #707070;
			color: var(--tocnav-normal-text);
			background: white;
			background: var(--tocnav-normal-bg);
		}
		#toc-nav > a:hover,
		#toc-nav > a:focus {
			color: black;
			color: var(--tocnav-hover-text);
			background: #f8f8f8;
			background: var(--tocnav-hover-bg);
		}
		#toc-nav > a:active {
			color: #c00;
			color: var(--tocnav-active-text);
			background: white;
			background: var(--tocnav-active-bg);
		}

		#toc-nav > #toc-jump {
			padding-bottom: 2em;
			margin-bottom: -1.9em;
		}

		/* statusbar gets in the way on keyboard focus; remove once browsers fix */
		#toc-nav > a[href="#toc"]:not(:hover):focus:last-child {
			padding-bottom: 1.5rem;
		}

		#toc-nav:not(:hover) > a:not(:focus) > span + span {
			/* Ideally this uses :focus-within on #toc-nav */
			display: none;
		}
		#toc-nav > a > span + span {
			padding-right: 0.2em;
		}
	}

/** ToC Sidebar ***************************************************************/

	/* Floating sidebar */
	@media screen {
		body.toc-sidebar #toc {
			position: fixed;
			top: 0; bottom: 0;
			left: 0;
			width: 23.5em;
			max-width: 80%;
			max-width: calc(100% - 2em - 26px);
			overflow: auto;
			padding: 0 1em;
			padding-left: 42px;
			padding-left: calc(1em + 26px);
			color: black;
			color: var(--tocsidebar-text);
			background: inherit;
			background-color: #f7f8f9;
			background-color: var(--tocsidebar-bg);
			z-index: 1;
			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
		}
		body.toc-sidebar #toc h2 {
			margin-top: .8rem;
			font-variant: small-caps;
			font-variant: all-small-caps;
			text-transform: lowercase;
			font-weight: bold;
			color: gray;
			color: hsla(203,20%,40%,.7);
			color: var(--tocsidebar-heading-text);
		}
		body.toc-sidebar #toc-jump:not(:focus) {
			width: 0;
			height: 0;
			padding: 0;
			position: absolute;
			overflow: hidden;
		}
	}
	/* Hide main scroller when only the ToC is visible anyway */
	@media screen and (max-width: 28em) {
		body.toc-sidebar {
			overflow: hidden;
		}
	}

	/* Sidebar with its own space */
	@media screen and (min-width: 78em) {
		body:not(.toc-inline) #toc {
			position: fixed;
			top: 0; bottom: 0;
			left: 0;
			width: 23.5em;
			overflow: auto;
			padding: 0 1em;
			padding-left: 42px;
			padding-left: calc(1em + 26px);
			color: black;
			color: var(--tocsidebar-text);
			background: inherit;
			background-color: #f7f8f9;
			background-color: var(--tocsidebar-bg);
			z-index: 1;
			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
		}
		body:not(.toc-inline) #toc h2 {
			margin-top: .8rem;
			font-variant: small-caps;
			font-variant: all-small-caps;
			text-transform: lowercase;
			font-weight: bold;
			color: gray;
			color: hsla(203,20%,40%,.7);
			color: var(--tocsidebar-heading-text);
		}

		body:not(.toc-inline) {
			padding-left: 29em;
		}
		/* See also Overflow section at the bottom */

		body:not(.toc-inline) #toc-jump:not(:focus) {
			width: 0;
			height: 0;
			padding: 0;
			position: absolute;
			overflow: hidden;
		}
	}
	@media screen and (min-width: 90em) {
		body:not(.toc-inline) {
			margin: 0 4em;
		}
	}

/******************************************************************************/
/*                                Sectioning                                  */
/******************************************************************************/

/** Headings ******************************************************************/

	h1, h2, h3, h4, h5, h6, dt {
		page-break-after: avoid;
		page-break-inside: avoid;
		font: 100% sans-serif;   /* Reset all font styling to clear out UA styles */
		font-family: inherit;	/* Inherit the font family. */
		line-height: 1.2;		/* Keep wrapped headings compact */
		hyphens: manual;		/* Hyphenated headings look weird */
	}

	h2, h3, h4, h5, h6 {
		margin-top: 3rem;
	}

	h1, h2, h3 {
		color: #005A9C;
		color: var(--heading-text);
	}

	h1 { font-size: 170%; }
	h2 { font-size: 140%; }
	h3 { font-size: 120%; }
	h4 { font-weight: bold; }
	h5 { font-style: italic; }
	h6 { font-variant: small-caps; }
	dt { font-weight: bold; }

/** Subheadings ***************************************************************/

	h1 + h2,
	#profile-and-date {
		/* #profile-and-date is a subtitle in an H2 under the H1 */
		margin-top: 0;
	}
	h2 + h3,
	h3 + h4,
	h4 + h5,
	h5 + h6 {
		margin-top: 1.2em; /* = 1 x line-height */
	}

/** Section divider ***********************************************************/

	:not(.head) > :not(.head) + hr {
		font-size: 1.5em;
		text-align: center;
		margin: 1em auto;
		height: auto;
		color: black;
		color: var(--hr-text);
		border: transparent solid 0;
		background: transparent;
	}
	:not(.head) > hr::before {
		content: "\2727\2003\2003\2727\2003\2003\2727";
	}

/******************************************************************************/
/*                            Paragraphs and Lists                            */
/******************************************************************************/

	p {
		margin: 1em 0;
	}

	dd > p:first-child,
	li > p:first-child {
		margin-top: 0;
	}

	ul, ol {
		margin-left: 0;
		padding-left: 2em;
	}

	li {
		margin: 0.25em 0 0.5em;
		padding: 0;
	}

	dl dd {
		margin: 0 0 .5em 2em;
	}

	.head dd + dd { /* compact for header */
		margin-top: -.5em;
	}

	/* Style for algorithms */
	ol.algorithm ol:not(.algorithm),
	.algorithm > ol ol:not(.algorithm) {
	border-left: 0.5em solid #DEF;
	border-left: 0.5em solid var(--algo-border);
	}

	/* Put nice boxes around each algorithm. */
	[data-algorithm]:not(.heading) {
	 padding: .5em;
	 border: thin solid #ddd;
	 border: thin solid var(--algo-border);
	 border-radius: .5em;
	 margin: .5em calc(-0.5em - 1px);
	}
	[data-algorithm]:not(.heading) > :first-child {
	 margin-top: 0;
	}
	[data-algorithm]:not(.heading) > :last-child {
	 margin-bottom: 0;
	}

	/* Style for switch/case <dl>s */
	dl.switch > dd > ol.only,
	dl.switch > dd > .only > ol {
	margin-left: 0;
	}
	dl.switch > dd > ol.algorithm,
	dl.switch > dd > .algorithm > ol {
	margin-left: -2em;
	}
	dl.switch {
	padding-left: 2em;
	}
	dl.switch > dt {
	text-indent: -1.5em;
	margin-top: 1em;
	}
	dl.switch > dt + dt {
	margin-top: 0;
	}
	dl.switch > dt::before {
	content: '\21AA';
	padding: 0 0.5em 0 0;
	display: inline-block;
	width: 1em;
	text-align: right;
	line-height: 0.5em;
	}

/** Terminology Markup ********************************************************/


/******************************************************************************/
/*                                 Inline Markup                              */
/******************************************************************************/

/** Terminology Markup ********************************************************/
	dfn   { /* Defining instance */
		font-weight: bolder;
	}
	a > i { /* Instance of term */
		font-style: normal;
	}
	dt dfn code, code.idl {
		font-size: inherit;
	}
	dfn var {
		font-style: normal;
	}

/** Change Marking ************************************************************/

	del {
		color: #aa0000;
		color: var(--del-text);
		background: transparent;
		background: var(--del-bg);
		text-decoration: line-through;
	}
	ins {
		color: #006100;
		color: var(--ins-text);
		background: transparent;
		background: var(--ins-bg);
		text-decoration: underline;
	}

	/* for amendments (candidate/proposed changes) */

	.amendment ins, .correction ins, .addition ins,
	ins[class^=c] {
		text-decoration-style: dotted;
	}
	.amendment del, .correction del, .addition del,
	del[class^=c] {
		text-decoration-style: dotted;
	}
	.amendment.proposed ins, .correction.proposed ins, .addition.proposed ins,
	ins[class^=c].proposed {
		text-decoration-style: double;
	}
	.amendment.proposed del, .correction.proposed del, .addition.proposed del,
	del[class^=c].proposed {
		text-decoration-style: double;
	}

/** Miscellaneous improvements to inline formatting ***************************/

	sup {
		vertical-align: super;
		font-size: 80%
	}

/******************************************************************************/
/*                                    Code                                    */
/******************************************************************************/

/** General monospace/pre rules ***********************************************/

	pre, code, samp {
		font-family: Menlo, Consolas, "DejaVu Sans Mono", Monaco, monospace;
		font-size: .9em;
		hyphens: none;
		text-transform: none;
		text-align: left;
		text-align: start;
		font-variant: normal;
		orphans: 3;
		widows: 3;
		page-break-before: avoid;
	}
	pre code,
	code code {
		font-size: 100%;
	}

	pre {
		margin-top: 1em;
		margin-bottom: 1em;
		overflow: auto;
	}

/** Inline Code fragments *****************************************************/

	/* Do something nice. */

/******************************************************************************/
/*                                    Links                                   */
/******************************************************************************/

/** General Hyperlinks ********************************************************/

	/* We hyperlink a lot, so make it less intrusive */
	a[href] {
		color: #034575;
		color: var(--a-normal-text);
		text-decoration: underline #707070;
		text-decoration: underline var(--a-normal-underline);
		text-decoration-skip-ink: none;
	}
	a:visited {
		color: #034575;
		color: var(--a-visited-text);
		text-decoration-color: #bbb;
		text-decoration-color: var(--a-visited-underline);
	}

	/* Indicate interaction with the link */
	a[href]:focus,
	a[href]:hover {
		text-decoration-thickness: 2px;
	}
	a[href]:active {
		color: #c00;
		color: var(--a-active-text);
		text-decoration-color: #c00;
		text-decoration-color: var(--a-active-underline);
	}

	/* Backout above styling for W3C logo */
	.head .logo,
	.head .logo a {
		border: none;
		text-decoration: none;
		background: transparent;
	}

/******************************************************************************/
/*                                    Images                                  */
/******************************************************************************/

	img {
		border-style: none;
	}

	img, svg {
		/* Intentionally not color-scheme aware. */
		background: white;
	}

	/* For autogen numbers, add
	  .caption::before, figcaption::before { content: "Figure " counter(figure) ". "; }
	*/

	figure, .figure, .sidefigure {
		page-break-inside: avoid;
		text-align: center;
		margin: 2.5em 0;
	}
	.figure img,	.sidefigure img,	figure img,
	.figure object, .sidefigure object, figure object {
		max-width: 100%;
		margin: auto;
		height: auto;
	}
	.figure pre, .sidefigure pre, figure pre {
		text-align: left;
		display: table;
		margin: 1em auto;
	}
	.figure table, figure table {
		margin: auto;
	}
	@media screen and (min-width: 20em) {
		.sidefigure {
			float: right;
			width: 50%;
			margin: 0 0 0.5em 0.5em;
		}
	}
	.caption, figcaption, caption {
		font-style: italic;
		font-size: 90%;
	}
	.caption::before, figcaption::before, figcaption > .marker {
		font-weight: bold;
	}
	.caption, figcaption {
		counter-increment: figure;
	}

	/* DL list is indented 2em, but figure inside it is not */
	dd > .figure, dd > figure { margin-left: -2em; }

/******************************************************************************/
/*                             Colored Boxes                                  */
/******************************************************************************/

	.issue, .note, .example, .assertion, .advisement, blockquote,
	.amendment, .correction, .addition {
		margin: 1em auto;
		padding: .5em;
		border: .5em;
		border-left-style: solid;
		page-break-inside: avoid;
	}
	span.issue, span.note {
		padding: .1em .5em .15em;
		border-right-style: solid;
	}

	blockquote > :first-child,
	.note  > p:first-child,
	.issue > p:first-child,
	.amendment > p:first-child,
	.correction > p:first-child,
	.addition > p:first-child {
		margin-top: 0;
	}
	blockquote > :last-child,
	.note  > p:last-child,
	.issue > p:last-child,
	.amendment > p:last-child,
	.correction > p:last-child,
	.addition > p:last-child {
		margin-bottom: 0;
	}


	.issue::before, .issue > .marker,
	.example::before, .example > .marker,
	.note::before, .note > .marker,
	details.note > summary > .marker,
	.amendment::before, .amendment > .marker,
	details.amendment > summary > .marker,
	.addition::before, .addition > .marker,
	addition.amendment > summary > .marker,
	.correction::before, .correction > .marker,
	correction.amendment > summary > .marker
	{
		text-transform: uppercase;
		padding-right: 1em;
	}

	.example::before, .example > .marker {
		display: block;
		padding-right: 0em;
	}

/** Blockquotes ***************************************************************/

	blockquote {
		border-color: silver;
		border-color: var(--blockquote-border);
		background: transparent;
		background: var(--blockquote-bg);
		color: currentcolor;
		color: var(--blockquote-text);
	}

/** Open issue ****************************************************************/

	.issue {
		border-color: #e05252;
		border-color: var(--issue-border);
		background: #fbe9e9;
		background: var(--issue-bg);
		color: black;
		color: var(--issue-text);
		counter-increment: issue;
		overflow: auto;
	}
	.issue::before, .issue > .marker {
		color: #831616;
		color: var(--issueheading-text);
	}
	/* Add .issue::before { content: "Issue " counter(issue) " "; } for autogen numbers,
	  or use class="marker" to mark up the issue number in source. */

/** Example *******************************************************************/

	.example {
		border-color: #e0cb52;
		border-color: var(--example-border);
		background: #fcfaee;
		background: var(--example-bg);
		color: black;
		color: var(--example-text);
		counter-increment: example;
		overflow: auto;
		clear: both;
	}
	.example::before, .example > .marker {
		color: #574b0f;
		color: var(--exampleheading-text);
	}
	/* Add .example::before { content: "Example " counter(example) " "; } for autogen numbers,
	  or use class="marker" to mark up the example number in source. */

/** Non-normative Note ********************************************************/

	.note {
		border-color: #52e052;
		border-color: var(--note-border);
		background: #e9fbe9;
		background: var(--note-bg);
		color: black;
		color: var(--note-text);
		overflow: auto;
	}

	.note::before, .note > .marker,
	details.note > summary {
		color: hsl(120, 70%, 30%);
		color: var(--noteheading-text);
	}
	/* Add .note::before { content: "Note "; } for autogen label,
	  or use class="marker" to mark up the label in source. */

	details.note[open] > summary {
		border-bottom: 1px silver solid;
		border-bottom: 1px var(--notesummary-underline) solid;
	}

/** Assertion Box *************************************************************/
	/*  for assertions in algorithms */

	.assertion {
		border-color: #AAA;
		border-color: var(--assertion-border);
		background: #EEE;
		background: var(--assertion-bg);
		color: black;
		color: var(--assertion-text);
	}

/** Advisement Box ************************************************************/
	/*  for attention-grabbing normative statements */

	.advisement {
		border-color: orange;
		border-color: var(--advisement-border);
		border-style: none solid;
		background: #fec;
		background: var(--advisement-bg);
		color: black;
		color: var(--advisement-text);
	}
	strong.advisement {
		display: block;
		text-align: center;
	}
	.advisement::before, .advisement > .marker {
		color: #b35f00;
		color: var(--advisementheading-text);
	}

/** Amendment Box *************************************************************/

	.amendment, .correction, .addition {
		border-color: #330099;
		border-color: var(--amendment-border);
		background: #F5F0FF;
		background: var(--amendment-bg);
		color: black;
		color: var(--amendment-text);
	}
	.amendment.proposed, .correction.proposed, .addition.proposed {
		border-style: solid;
		border-block-width: 0.25em;
	}
	.amendment::before, .amendment > .marker,
	details.amendment > summary::before, details.amendment > summary > .marker,
	.correction::before, .correction > .marker,
	details.correction > summary::before, details.correction > summary > .marker,
	.addition::before, .addition > .marker,
	details.addition > summary::before, details.addition > summary > .marker {
		color: #220066;
		color: var(--amendmentheading-text);
	}
	.amendment.proposed::before, .amendment.proposed > .marker,
	details.amendment.proposed > summary::before, details.amendment.proposed > summary > .marker,
	.correction.proposed::before, .correction.proposed > .marker,
	details.correction.proposed > summary::before, details.correction.proposed > summary > .marker,
	.addition.proposed::before, .addition.proposed > .marker,
	details.addition.proposed > summary::before, details.addition.proposed > summary > .marker {
		font-weight: bold;
	}

/** Spec Obsoletion Notice ****************************************************/
	/* obnoxious obsoletion notice for older/abandoned specs. */

	details {
		display: block;
	}
	summary {
		font-weight: bolder;
	}

	.annoying-warning:not(details),
	details.annoying-warning:not([open]) > summary,
	details.annoying-warning[open] {
		background: hsla(40,100%,50%,0.95);
		background: var(--warning-bg);
		color: black;
		color: var(--warning-text);
		padding: .75em 1em;
		border: red;
		border: var(--warning-border);
		border-style: solid none;
		box-shadow: 0 2px 8px black;
		text-align: center;
	}
	.annoying-warning :last-child {
		margin-bottom: 0;
	}

@media not print {
	details.annoying-warning[open] {
		position: fixed;
		left: 0;
		right: 0;
		bottom: 2em;
		z-index: 1000;
	}
}

	details.annoying-warning:not([open]) > summary {
		text-align: center;
	}

/** Entity Definition Boxes ***************************************************/

	.def {
		padding: .5em 1em;
		background: #def;
		background: var(--def-bg);
		margin: 1.2em 0;
		border-left: 0.5em solid #8ccbf2;
		border-left: 0.5em solid var(--def-border);
		color: black;
		color: var(--def-text);
	}

/******************************************************************************/
/*                                    Tables                                  */
/******************************************************************************/

	th, td {
		text-align: left;
		text-align: start;
	}

/** Property/Descriptor Definition Tables *************************************/

	table.def {
		/* inherits .def box styling, see above */
		width: 100%;
		border-spacing: 0;
	}

	table.def td,
	table.def th {
		padding: 0.5em;
		vertical-align: baseline;
		border-bottom: 1px solid #bbd7e9;
		border-bottom: 1px solid var(--defrow-border);
	}

	table.def > tbody > tr:last-child th,
	table.def > tbody > tr:last-child td {
		border-bottom: 0;
	}

	table.def th {
		font-style: italic;
		font-weight: normal;
		padding-left: 1em;
		width: 3em;
	}

	/* For when values are extra-complex and need formatting for readability */
	table td.pre {
		white-space: pre-wrap;
	}

	/* A footnote at the bottom of a def table */
	table.def td.footnote {
		padding-top: 0.6em;
	}
	table.def td.footnote::before {
		content: " ";
		display: block;
		height: 0.6em;
		width: 4em;
		border-top: thin solid;
	}

/** Data tables (and properly marked-up index tables) *************************/
	/*
		<table class="data"> highlights structural relationships in a table
		when correct markup is used (e.g. thead/tbody, th vs. td, scope attribute)

		Use class="complex data" for particularly complicated tables --
		(This will draw more lines: busier, but clearer.)

		Use class="long" on table cells with paragraph-like contents
		(This will adjust text alignment accordingly.)
		Alternately use class="longlastcol" on tables, to have the last column assume "long".
	*/

	table {
		word-wrap: normal;
		overflow-wrap: normal;
		hyphens: manual;
	}

	table.data,
	table.index {
		margin: 1em auto;
		border-collapse: collapse;
		border: hidden;
		width: 100%;
	}
	table.data caption,
	table.index caption {
		max-width: 50em;
		margin: 0 auto 1em;
	}

	table.data td,  table.data th,
	table.index td, table.index th {
		padding: 0.5em 1em;
		border-width: 1px;
		border-color: silver;
		border-color: var(--datacell-border);
		border-top-style: solid;
	}

	table.data thead td:empty {
		padding: 0;
		border: 0;
	}

	table.data  thead,
	table.index thead,
	table.data  tbody,
	table.index tbody {
		border-bottom: 2px solid;
	}

	table.data colgroup,
	table.index colgroup {
		border-left: 2px solid;
	}

	table.data  tbody th:first-child,
	table.index tbody th:first-child  {
		border-right: 2px solid;
		border-top: 1px solid silver;
		border-top: 1px solid var(--datacell-border);
		padding-right: 1em;
	}

	table.data th[colspan],
	table.data td[colspan] {
		text-align: center;
	}

	table.complex.data th,
	table.complex.data td {
		border: 1px solid silver;
		border: 1px solid var(--datacell-border);
		text-align: center;
	}

	table.data.longlastcol td:last-child,
	table.data td.long {
		vertical-align: baseline;
		text-align: left;
	}

	table.data img {
		vertical-align: middle;
	}


/*
Alternate table alignment rules

	table.data,
	table.index {
		text-align: center;
	}

	table.data  thead th[scope="row"],
	table.index thead th[scope="row"] {
		text-align: right;
	}

	table.data  tbody th:first-child,
	table.index tbody th:first-child  {
		text-align: right;
	}

Possible extra rowspan handling

	table.data  tbody th[rowspan]:not([rowspan='1']),
	table.index tbody th[rowspan]:not([rowspan='1']),
	table.data  tbody td[rowspan]:not([rowspan='1']),
	table.index tbody td[rowspan]:not([rowspan='1']) {
		border-left: 1px solid silver;
	}

	table.data  tbody th[rowspan]:first-child,
	table.index tbody th[rowspan]:first-child,
	table.data  tbody td[rowspan]:first-child,
	table.index tbody td[rowspan]:first-child{
		border-left: 0;
		border-right: 1px solid silver;
	}
*/

/******************************************************************************/
/*                                  Indices                                   */
/******************************************************************************/


/** Table of Contents *********************************************************/

	.toc a {
		/* More spacing; use padding to make it part of the click target. */
		padding: 0.1rem 1px 0;
		/* Larger, more consistently-sized click target */
		display: block;
		/* Switch to using border-bottom for underlines */
		text-decoration: none;
		border-bottom: 1px solid;
		/* Reverse color scheme */
		color: black;
		color: var(--toclink-text);
		border-color: #3980b5;
		border-color: var(--toclink-underline);
	}
	.toc a:visited {
		color: black;
		color: var(--toclink-visited-text);
		border-color: #054572;
		border-color: var(--toclink-visited-underline);
	}
	.toc a:focus,
	.toc a:hover {
		background: rgba(75%, 75%, 75%, .25);
		background: var(--a-hover-bg);
		border-bottom-width: 3px;
		margin-bottom: -2px;
	}
	.toc a:not(:focus):not(:hover) {
		/* Allow colors to cascade through from link styling */
		border-bottom-color: transparent;
	}

	.toc, .toc ol, .toc ul, .toc li {
		list-style: none; /* Numbers must be inlined into source */
		/* because generated content isn't search/selectable and markers can't do multilevel yet */
		margin:  0;
		padding: 0;
	}
	.toc {
		line-height: 1.1em;
	}

	/* ToC not indented until third level, but font style & margins show hierarchy */
	.toc > li			{ font-weight: bold;   }
	.toc > li li		 { font-weight: normal; }
	.toc > li li li	  { font-size:   95%;	}
	.toc > li li li li	{ font-size:   90%;	}
	.toc > li li li li li { font-size:   85%;	}

	/* @supports not (display:grid) { */
		.toc > li			{ margin: 1.5rem 0;	}
		.toc > li li		 { margin: 0.3rem 0;	}
		.toc > li li li	  { margin-left: 2rem;   }

		/* Section numbers in a column of their own */
		.toc .secno {
			float: left;
			width: 4rem;
			white-space: nowrap;
		}
		.toc > li li li li .secno { font-size: 85%; }
		.toc > li li li li li .secno { font-size: 100%; }

		.toc li {
			clear: both;
		}

		:not(li) > .toc			 { margin-left:  5rem; }
		.toc .secno				 { margin-left: -5rem; }
		.toc > li li li .secno	  { margin-left: -7rem; }
		.toc > li li li li .secno	{ margin-left: -9rem; }
		.toc > li li li li li .secno { margin-left: -11rem; }

		/* Tighten up indentation in narrow ToCs */
		@media (max-width: 30em) {
			:not(li) > .toc			 { margin-left:  4rem; }
			.toc .secno				 { margin-left: -4rem; }
			.toc > li li li			 { margin-left:  1rem; }
			.toc > li li li .secno	  { margin-left: -5rem; }
			.toc > li li li li .secno	{ margin-left: -6rem; }
			.toc > li li li li li .secno { margin-left: -7rem; }
		}
		/* Loosen it on wide screens */
		@media screen and (min-width: 78em) {
			body:not(.toc-inline) :not(li) > .toc			 { margin-left:  4rem; }
			body:not(.toc-inline) .toc .secno				 { margin-left: -4rem; }
			body:not(.toc-inline) .toc > li li li			 { margin-left:  1rem; }
			body:not(.toc-inline) .toc > li li li .secno	  { margin-left: -5rem; }
			body:not(.toc-inline) .toc > li li li li .secno	{ margin-left: -6rem; }
			body:not(.toc-inline) .toc > li li li li li .secno { margin-left: -7rem; }
	}
	/* } */

	@supports (display:grid) and (display:contents) {
		/* Use #toc over .toc to override non-@supports rules. */
		#toc {
			display: grid;
			align-content: start;
			grid-template-columns: auto 1fr;
			grid-column-gap: 1rem;
			column-gap: 1rem;
			grid-row-gap: .6rem;
			row-gap: .6rem;
		}
		#toc h2 {
			grid-column: 1 / -1;
			margin-bottom: 0;
		}
		#toc ol,
		#toc li,
		#toc a {
			display: contents;
			/* Switch <a> to subgrid when supported */
		}
		#toc span {
			margin: 0;
		}
		#toc > .toc > li > a > span {
			/* The spans of the top-level list,
			  comprising the first items of each top-level section. */
			margin-top: 1.1rem;
		}
		#toc#toc .secno { /* Ugh, need more specificity to override base.css */
			grid-column: 1;
			width: auto;
			margin-left: 0;
		}
		#toc .content {
			grid-column: 2;
			width: auto;
			margin-right: 1rem;
			border-bottom: 3px solid transparent;
			margin-bottom: -3px;
		}
		#toc .content:hover,
		#toc .content:focus {
			background: rgba(75%, 75%, 75%, .25);
			background: var(--a-hover-bg);
			border-bottom-color: #054572;
			border-bottom-color: var(--toclink-underline);
		}
		#toc li li li .content {
			margin-left: 1rem;
		}
		#toc li li li li .content {
			margin-left: 2rem;
		}
	}


/** Index *********************************************************************/

	/* Index Lists: Layout */
	ul.index	  { margin-left: 0; columns: 15em; text-indent: 1em hanging; }
	ul.index li	{ margin-left: 0; list-style: none; break-inside: avoid; }
	ul.index li li { margin-left: 1em; }
	ul.index dl	{ margin-top: 0; }
	ul.index dt	{ margin: .2em 0 .2em 20px;}
	ul.index dd	{ margin: .2em 0 .2em 40px;}
	/* Index Lists: Typography */
	ul.index ul,
	ul.index dl { font-size: smaller; }
	@media not print {
		ul.index li a + span {
			white-space: nowrap;
			color: transparent; }
		ul.index li a:hover + span,
		ul.index li a:focus + span {
			color: #707070;
			color: var(--indexinfo-text);
		}
	}

/** Index Tables *****************************************************/
	/* See also the data table styling section, which this effectively subclasses */

	table.index {
		font-size: small;
		border-collapse: collapse;
		border-spacing: 0;
		text-align: left;
		margin: 1em 0;
	}

	table.index td,
	table.index th {
		padding: 0.4em;
	}

	table.index tr:hover td:not([rowspan]),
	table.index tr:hover th:not([rowspan]) {
		color: black;
		color: var(--indextable-hover-text);
		background: #f7f8f9;
		background: var(--indextable-hover-bg);
	}

	/* The link in the first column in the property table (formerly a TD) */
	table.index th:first-child a {
		font-weight: bold;
	}

/** Outdated warning **********************************************************/

.outdated-spec {
	color: black;
	color: var(--outdatedspec-text);
	background-color: rgba(0,0,0,0.5);
	background-color: var(--outdatedspec-bg);
}

.outdated-warning {
	position: fixed;
	bottom: 50%;
	left: 0;
	right: 0;
	margin: 0 auto;
	width: 50%;
	background: maroon;
	background: var(--outdated-bg);
	color: white;
	color: var(--outdated-text);
	border-radius: 1em;
	box-shadow: 0 0 1em red;
	box-shadow: 0 0 1em var(--outdated-shadow);
	padding: 2em;
	text-align: center;
	z-index: 2;
}

.outdated-warning a {
	color: currentcolor;
	background: transparent;
}

.edited-rec-warning {
	background: darkorange;
	background: var(--editedrec-bg);
	box-shadow: 0 0 1em;
}

.outdated-warning button {
	color: var(--outdated-text);
	border-radius: 1em;
	box-shadow: 0 0 1em red;
	box-shadow: 0 0 1em var(--outdated-shadow);
	padding: 2em;
	text-align: center;
	z-index: 2;
}

.outdated-warning a {
	color: currentcolor;
	background: transparent;
}

.edited-rec-warning {
	background: darkorange;
	background: var(--editedrec-bg);
	box-shadow: 0 0 1em;
}

.outdated-warning button {
	position: absolute;
	top: 0;
	right:0;
	margin: 0;
	border: 0;
	padding: 0.25em 0.5em;
	background: transparent;
	color: white;
	color: var(--outdated-text);
	font:1em sans-serif;
	text-align:center;
}

.outdated-warning span {
	display: block;
}

.outdated-collapsed {
	bottom: 0;
	border-radius: 0;
	width: 100%;
	padding: 0;
}

/******************************************************************************/
/*                                    Print                                   */
/******************************************************************************/

	@media print {
		/* Pages have their own margins. */
		html {
			margin: 0;
		}
		/* Serif for print. */
		body {
			font-family: serif;
		}

		.outdated-warning {
			position: absolute;
			border-style: solid;
			border-color: red;
		}

		.outdated-warning input {
			display: none;
		}
	}
	@page {
		margin: 1.5cm 1.1cm;
	}



/******************************************************************************/
/*                             Overflow Control                               */
/******************************************************************************/

	.figure .caption, .sidefigure .caption, figcaption {
		/* in case figure is overlarge, limit caption to 50em */
		max-width: 50rem;
		margin-left: auto;
		margin-right: auto;
	}
	.overlarge {
		/* Magic to create good item positioning:
		  "content column" is 50ems wide at max; less on smaller screens.
		  Extra space (after ToC + content) is empty on the right.

		  1. When item < content column, centers item in column.
		  2. When content < item < available, left-aligns.
		  3. When item > available, fills available + scroll bar.
		*/
		display: grid;
		grid-template-columns: minmax(0, 50em);
	}
	.overlarge > table {
		/* limit preferred width of table */
		max-width: 50em;
		margin-left: auto;
		margin-right: auto;
	}

	@media (min-width: 55em) {
		.overlarge {
			margin-right: calc(13px + 26.5rem - 50vw);
			max-width: none;
		}
	}
	@media screen and (min-width: 78em) {
		body:not(.toc-inline) .overlarge {
			/* 30.5em body padding 50em content area */
			margin-right: calc(40em - 50vw) !important;
		}
	}
	@media screen and (min-width: 90em) {
		body:not(.toc-inline) .overlarge {
			/* 4em html margin 30.5em body padding 50em content area */
			margin-right: calc(84.5em - 100vw) !important;
		}
	}

	@media not print {
		.overlarge {
			overflow-x: auto;
			/* See Lea Verou's explanation background-attachment:
			* http://lea.verou.me/2012/04/background-attachment-local/
			*
			background: top left  / 4em 100% linear-gradient(to right,  #ffffff, rgba(255, 255, 255, 0)) local,
						top right / 4em 100% linear-gradient(to left, #ffffff, rgba(255, 255, 255, 0)) local,
						top left  / 1em 100% linear-gradient(to right,  #c3c3c5, rgba(195, 195, 197, 0)) scroll,
						top right / 1em 100% linear-gradient(to left, #c3c3c5, rgba(195, 195, 197, 0)) scroll,
						white;
			background-repeat: no-repeat;
			*/
		}
	}
</style>
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 <body class="h-entry">
  <div class="head">
   <p data-fill-with="logo"></p>
   <h1 class="p-name no-ref" id="title">P3628R0<br><code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code> and <code class="highlight"><c- k>continue</c-> <c- n>label</c-><c- p>;</c-></code>, tl; dr</h1>
   <h2 class="no-num no-toc no-ref heading settled" id="profile-and-date"><span class="content">Published Proposal, <time class="dt-updated" datetime="2025-02-12">2025-02-12</time></span></h2>
   <div data-fill-with="spec-metadata">
    <dl>
     <dt>This version:
     <dd><a class="u-url" href="https://eisenwave.github.io/cpp-proposals/break-continue-label-tldr.html">https://eisenwave.github.io/cpp-proposals/break-continue-label-tldr.html</a>
     <dt class="editor">Author:
     <dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:janschultke@gmail.com">Jan Schultke</a>
     <dt>Audience:
     <dd>SG22, SG17
     <dt>Project:
     <dd>ISO/IEC 14882 Programming Languages — C++, ISO/IEC JTC1/SC22/WG21
     <dt>Source:
     <dd><a href="https://github.com/Eisenwave/cpp-proposals/blob/master/src/break-continue-label-tldr.bs">eisenwave/cpp-proposals</a>
    </dl>
   </div>
   <div data-fill-with="warning"></div>
   <hr title="Separator for header">
  </div>
  <div class="p-summary" data-fill-with="abstract">
   <h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
   <p>Abridged version of <a data-link-type="biblio" href="#biblio-p3568r0" title="break label; and continue label;">[P3568R0]</a>.</p>
  </div>
  <nav data-fill-with="table-of-contents" id="toc">
   <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
   <ol class="toc" role="directory">
    <li><a href="#introduction"><span class="secno">1</span> <span class="content">Introduction</span></a>
    <li>
     <a href="#motivation"><span class="secno">2</span> <span class="content">Motivation</span></a>
     <ol class="toc">
      <li>
       <a href="#no-good-alternatives"><span class="secno">2.1</span> <span class="content">No good alternative</span></a>
       <ol class="toc">
        <li><a href="#alternative-goto"><span class="secno">2.1.1</span> <span class="content"><code class="highlight"><c- k>goto</c-></code></span></a>
        <li><a href="#alternative-iile"><span class="secno">2.1.2</span> <span class="content">Immediately invoked lambda expression (IILE)</span></a>
        <li><a href="#alternative-bool-state"><span class="secno">2.1.3</span> <span class="content">Mutable <code class="highlight"><c- b>bool</c-></code> state</span></a>
       </ol>
      <li><a href="#argumentum-ad-populum"><span class="secno">2.2</span> <span class="content">Argumentum ad populum</span></a>
     </ol>
    <li>
     <a href="#design-considerations"><span class="secno">3</span> <span class="content">Design Considerations</span></a>
     <ol class="toc">
      <li><a href="#alternative-break-continue-forms"><span class="secno">3.1</span> <span class="content">Alternative <code class="highlight"><c- k>break</c-></code> and <code class="highlight"><c- k>continue</c-></code> forms</span></a>
      <li><a href="#constexpr-break-continue"><span class="secno">3.2</span> <span class="content"><code class="highlight"><c- k>constexpr</c-></code> <code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code> and <code class="highlight"><c- k>continue</c-> <c- n>label</c-><c- p>;</c-></code></span></a>
      <li>
       <a href="#syntax"><span class="secno">3.3</span> <span class="content">Syntax warzone</span></a>
       <ol class="toc">
        <li><a href="#n3377-benefits"><span class="secno">3.3.1</span> <span class="content">N3377 benefits</span></a>
        <li>
         <a href="#n3377-problems"><span class="secno">3.3.2</span> <span class="content">N3377 problems</span></a>
         <ol class="toc">
          <li><a href="#against-n3377-breaking-precedent"><span class="secno">3.3.2.1</span> <span class="content">Breaking precedent of most prior art</span></a>
          <li><a href="#against-n3377-repetition"><span class="secno">3.3.2.2</span> <span class="content">Repetition</span></a>
          <li><a href="#against-n3377-extendability"><span class="secno">3.3.2.3</span> <span class="content">Extendability</span></a>
          <li><a href="#against-n3377-keywords"><span class="secno">3.3.2.4</span> <span class="content">Blocking contextual keywords</span></a>
          <li><a href="#against-n3377-macro-loops"><span class="secno">3.3.2.5</span> <span class="content">Labeling loops expanded from macros</span></a>
         </ol>
       </ol>
      <li>
       <a href="#changes-to-labels"><span class="secno">3.4</span> <span class="content">Changes to labels</span></a>
       <ol class="toc">
        <li><a href="#new-labels-goto"><span class="secno">3.4.1</span> <span class="content">New labels - <code class="highlight"><c- k>goto</c-></code></span></a>
        <li><a href="#new-labels-nesting"><span class="secno">3.4.2</span> <span class="content">New labels - nesting?</span></a>
        <li><a href="#new-labels-duplicates"><span class="secno">3.4.3</span> <span class="content">New labels - direct duplicates?</span></a>
        <li><a href="#new-labels-break-label-multiple"><span class="secno">3.4.4</span> <span class="content">New labels - what about <code class="highlight"><c- k>break</c-> <c- n>label</c-></code> for loops with more than one label?</span></a>
       </ol>
     </ol>
    <li><a href="#impact-on-existing-code"><span class="secno">4</span> <span class="content">Impact on existing code</span></a>
    <li><a href="#implementation-experience"><span class="secno">5</span> <span class="content">Implementation experience</span></a>
    <li><a href="#proposed-wording"><span class="secno">6</span> <span class="content">Proposed wording</span></a>
    <li>
     <a href="#references"><span class="secno"></span> <span class="content">References</span></a>
     <ol class="toc">
      <li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
      <li><a href="#informative"><span class="secno"></span> <span class="content">Informative References</span></a>
     </ol>
   </ol>
  </nav>
  <main>
   <h2 class="heading settled" data-level="1" id="introduction"><span class="secno">1. </span><span class="content">Introduction</span><a class="self-link" href="#introduction"></a></h2>
   <p>Proposed functionality:</p>
<pre class="language-cpp highlight"><c- nl>outer</c-><c- p>:</c-> <c- k>for</c-> <c- p>(</c-><c- k>auto</c-> <c- n>x</c-> <c- o>:</c-> <c- n>xs</c-><c- p>)</c-> <c- p>{</c->
    <c- k>for</c-> <c- p>(</c-><c- k>auto</c-> <c- n>y</c-> <c- o>:</c-> <c- n>ys</c-><c- p>)</c-> <c- p>{</c->
        <c- k>if</c-> <c- p>(</c-><c- d>/* ... */</c-><c- p>)</c-> <c- p>{</c->
            <c- k>continue</c-> <c- n>outer</c-><c- p>;</c-> <c- c1>// OK, continue applies to outer for loop</c->
            <c- k>break</c-> <c- n>outer</c-><c- p>;</c->    <c- c1>// OK, break applies to outer for loop  </c->
        <c- p>}</c->
    <c- p>}</c->
<c- p>}</c->

<c- nl>switch_label</c-><c- p>:</c-> <c- k>switch</c-> <c- p>(</c-><c- d>/* ... */</c-><c- p>)</c-> <c- p>{</c->
    <c- k>default</c-><c- o>:</c-> <c- k>while</c-> <c- p>(</c->true<c- p>)</c-> <c- p>{</c->
        <c- k>if</c-> <c- p>(</c-><c- d>/* ...*/</c-><c- p>)</c-> <c- p>{</c->
            <c- k>break</c-> <c- n>switch_label</c-><c- p>;</c-> <c- c1>// OK, break applies to switch, not to while loop</c->
        <c- p>}</c->
    <c- p>}</c->
<c- p>}</c->

<c- k>break</c-> <c- n>outer</c-><c- p>;</c->       <c- c1>// error: cannot break loop from the outside</c->
<c- k>goto</c-> <c- n>outer</c-><c- p>;</c->        <c- c1>// OK, used to be OK, and is unaffected by this proposal</c->

<c- nl>switch_label</c-><c- p>:;</c->     <c- c1>// OK, labels can be reused</c->
<c- k>goto</c-> <c- n>switch_label</c-><c- p>;</c-> <c- c1>// error: jump target is ambiguous</c->
</pre>
   <ul>
    <li data-md>
     <p>Proposed syntax (except label relaxations) is identical to <a data-link-type="biblio" href="#biblio-n3355" title="N3355: Named loops, v3">[N3355]</a>, accepted into C2y.</p>
   </ul>
   <p><strong>Decisions required:</strong></p>
   <ol>
    <li data-md>
     <p>Do we want <code class="highlight"><c- k>break</c-> <c- n>label</c-></code> at all?</p>
    <li data-md>
     <p>Do we want this syntax?</p>
   </ol>
   <p>Functionality was proposed before in <a data-link-type="biblio" href="#biblio-n3879" title="Explicit Flow Control: break label, goto case and explicit switch">[N3879]</a> and rejected at Rapperswil 2014 (<a data-link-type="biblio" href="#biblio-n4327" title="C++ Standard Evolution Closed Issues List (Revision R10)">[N4327]</a>):</p>
   <blockquote>
    <p>Straw poll, proposal as a whole:</p>
    <table>
     <tbody>
      <tr>
       <td>SF
       <td>F
       <td>N
       <td>A
       <td>SA
      <tr>
       <td>1
       <td>1
       <td>1
       <td>13
       <td>10
    </table>
    <p>"break label;" + "continue label;"</p>
    <table>
     <tbody>
      <tr>
       <td>SF
       <td>F
       <td>N
       <td>A
       <td>SA
      <tr>
       <td>3
       <td>8
       <td>4
       <td>9
       <td>3
    </table>
   </blockquote>
   <p>However, things have changed since 2014:</p>
   <ul>
    <li data-md>
     <p>C2y acceptance.</p>
    <li data-md>
     <p><code class="highlight"><c- k>constexpr</c-></code> much more common now, but <code class="highlight"><c- k>goto</c-></code> workaround doesn’t work.</p>
    <li data-md>
     <p><code class="highlight"><c- k>break</c-> <c- n>label</c-></code> staple of new languages; see Rust, Kotlin, Cpp2.</p>
   </ul>
   <h2 class="heading settled" data-level="2" id="motivation"><span class="secno">2. </span><span class="content">Motivation</span><a class="self-link" href="#motivation"></a></h2>
   <ul>
    <li data-md>
     <p><code class="highlight"><c- k>break</c-> <c- n>label</c-></code> and <code class="highlight"><c- k>continue</c-></code> label useful for controlling nested loops/switches.</p>
    <li data-md>
     <p>Early <code class="highlight"><c- k>return</c-></code> not always viable alternative:</p>
     <ul>
      <li data-md>
       <p>not viable in every function</p>
      <li data-md>
       <p>MISRA-C++:2008 Rule 6-6-5 "A function shall have a single point of exit at the end of the function"</p>
      <li data-md>
       <p>does not replace <code class="highlight"><c- k>continue</c-></code></p>
     </ul>
   </ul>
   <h3 class="heading settled" data-level="2.1" id="no-good-alternatives"><span class="secno">2.1. </span><span class="content">No good alternative</span><a class="self-link" href="#no-good-alternatives"></a></h3>
<pre class="language-cpp highlight"><c- nl>process_files</c-><c- p>:</c-> <c- k>for</c-> <c- p>(</c-><c- k>const</c-> <c- n>File</c-><c- o>&amp;</c-> <c- n>text_file</c-> <c- o>:</c-> <c- n>files</c-><c- p>)</c-> <c- p>{</c->
    <c- k>for</c-> <c- p>(</c-><c- n>std</c-><c- o>::</c-><c- n>string_view</c-> <c- n>line</c-> <c- o>:</c-> <c- n>text_file</c-><c- p>.</c-><c- n>lines</c-><c- p>())</c-> <c- p>{</c->
        <c- k>if</c-> <c- p>(</c-><c- n>makes_me_angry</c-><c- p>(</c-><c- n>line</c-><c- p>))</c-> <c- p>{</c->
            <c- k>continue</c-> <c- n>process_files</c-><c- p>;</c->
        <c- p>}</c->
        <c- n>consume</c-><c- p>(</c-><c- n>line</c-><c- p>);</c->
    <c- p>}</c->
    <c- n>std</c-><c- o>::</c-><c- n>println</c-><c- p>(</c-><c- s>"Processed {}"</c-><c- p>,</c-> <c- n>text_file</c-><c- p>.</c-><c- n>path</c-><c- p>());</c->
<c- p>}</c->
<c- n>std</c-><c- o>::</c-><c- n>println</c-><c- p>(</c-><c- s>"Processed all files"</c-><c- p>);</c->
</pre>
   <ul>
    <li data-md>
     <p><code class="highlight"><c- k>continue</c-> <c- n>process_files</c-></code> works really well, very readable.</p>
    <li data-md>
     <p><code class="highlight"><c- k>break</c-><c- p>;</c-></code> would skip <code class="highlight"><c- n>std</c-><c- o>::</c-><c- n>println</c-></code>.</p>
   </ul>
   <h4 class="heading settled" data-level="2.1.1" id="alternative-goto"><span class="secno">2.1.1. </span><span class="content"><code class="highlight"><c- k>goto</c-></code></span><a class="self-link" href="#alternative-goto"></a></h4>
<pre class="language-cpp highlight"><c- k>for</c-> <c- p>(</c-><c- k>const</c-> <c- n>File</c-><c- o>&amp;</c-> <c- n>text_file</c-> <c- o>:</c-> <c- n>files</c-><c- p>)</c-> <c- p>{</c->
    <c- k>for</c-> <c- p>(</c-><c- n>std</c-><c- o>::</c-><c- n>string_view</c-> <c- n>line</c-> <c- o>:</c-> <c- n>text_file</c-><c- p>.</c-><c- n>lines</c-><c- p>())</c-> <c- p>{</c->
        <c- k>if</c-> <c- p>(</c-><c- n>makes_me_angry</c-><c- p>(</c-><c- n>line</c-><c- p>))</c-> <c- p>{</c->
            <c- k>goto</c-> <c- n>done_with_file</c-><c- p>;</c->
        <c- p>}</c->
        <c- n>consume</c-><c- p>(</c-><c- n>line</c-><c- p>);</c->
    <c- p>}</c->
    <c- n>std</c-><c- o>::</c-><c- n>println</c-><c- p>(</c-><c- s>"Processed {}"</c-><c- p>,</c-> <c- n>text_file</c-><c- p>.</c-><c- n>path</c-><c- p>());</c->
    <c- nl>done_with_file</c-><c- p>:</c->
<c- p>}</c->
<c- n>std</c-><c- o>::</c-><c- n>println</c-><c- p>(</c-><c- s>"Processed all files"</c-><c- p>);</c->
</pre>
   <p>Works, but:</p>
   <ul>
    <li data-md>
     <p><code class="highlight"><c- k>goto</c-></code> cannot cross (non-vacuous) initialization
(problematic if we add variable before <code class="highlight"><c- n>std</c-><c- o>::</c-><c- n>println</c-></code>)</p>
    <li data-md>
     <p>not <code class="highlight"><c- k>constexpr</c-></code></p>
    <li data-md>
     <p>Discouraged heavily (CppCoreGuidelines, MISRA, etc.)</p>
    <li data-md>
     <p>No community consensus when <em>exactly</em> <code class="highlight"><c- k>goto</c-></code> is OK.</p>
    <li data-md>
     <p>Meaning of <code class="highlight"><c- k>goto</c-></code> unclear until seeing label location.</p>
    <li data-md>
     <p>Bad label name = confusing control flow.</p>
    <li data-md>
     <p>Super controversial.</p>
   </ul>
   <h4 class="heading settled" data-level="2.1.2" id="alternative-iile"><span class="secno">2.1.2. </span><span class="content">Immediately invoked lambda expression (IILE)</span><a class="self-link" href="#alternative-iile"></a></h4>
<pre class="language-cpp highlight"><c- k>for</c-> <c- p>(</c-><c- k>const</c-> <c- n>File</c-><c- o>&amp;</c-> <c- n>text_file</c-> <c- o>:</c-> <c- n>files</c-><c- p>)</c-> <c- p>{</c->
    <c- p>[</c-><c- o>&amp;</c-><c- p>]</c-> <c- p>{</c->
        <c- k>for</c-> <c- p>(</c-><c- n>std</c-><c- o>::</c-><c- n>string_view</c-> <c- n>line</c-> <c- o>:</c-> <c- n>text_file</c-><c- p>.</c-><c- n>lines</c-><c- p>())</c-> <c- p>{</c->
            <c- k>if</c-> <c- p>(</c-><c- n>makes_me_angry</c-><c- p>(</c-><c- n>line</c-><c- p>))</c-> <c- p>{</c->
                <c- k>return</c-><c- p>;</c->
            <c- p>}</c->
            <c- n>consume</c-><c- p>(</c-><c- n>line</c-><c- p>);</c->
        <c- p>}</c->
        <c- n>std</c-><c- o>::</c-><c- n>println</c-><c- p>(</c-><c- s>"Processed {}"</c-><c- p>,</c-> <c- n>text_file</c-><c- p>.</c-><c- n>path</c-><c- p>());</c->
    <c- p>}();</c->
<c- p>}</c->
<c- n>std</c-><c- o>::</c-><c- n>println</c-><c- p>(</c-><c- s>"Processed all files"</c-><c- p>);</c->
</pre>
   <p>Works, but:</p>
   <ul>
    <li data-md>
     <p>Can no longer <code class="highlight"><c- k>break</c-></code> outer loop.</p>
    <li data-md>
     <p>More indentation level.</p>
    <li data-md>
     <p>Cost in constant evaluation, debug builds.</p>
    <li data-md>
     <p><code class="highlight"><c- k>return</c-><c- p>;</c-></code> expresses intent poorly.</p>
   </ul>
   <h4 class="heading settled" data-level="2.1.3" id="alternative-bool-state"><span class="secno">2.1.3. </span><span class="content">Mutable <code class="highlight"><c- b>bool</c-></code> state</span><a class="self-link" href="#alternative-bool-state"></a></h4>
<pre class="language-cpp highlight"><c- k>for</c-> <c- p>(</c-><c- k>const</c-> <c- n>File</c-><c- o>&amp;</c-> <c- n>text_file</c-> <c- o>:</c-> <c- n>files</c-><c- p>)</c-> <c- p>{</c->
    <c- b>bool</c-> <c- n>success</c-> <c- o>=</c-> true<c- p>;</c->
    <c- k>for</c-> <c- p>(</c-><c- n>std</c-><c- o>::</c-><c- n>string_view</c-> <c- n>line</c-> <c- o>:</c-> <c- n>text_file</c-><c- p>.</c-><c- n>lines</c-><c- p>())</c-> <c- p>{</c->
        <c- k>if</c-> <c- p>(</c-><c- n>makes_me_angry</c-><c- p>(</c-><c- n>line</c-><c- p>))</c-> <c- p>{</c->
            <c- n>success</c-> <c- o>=</c-> false<c- p>;</c->
            <c- k>break</c-><c- p>;</c->
        <c- p>}</c->
        <c- n>consume</c-><c- p>(</c-><c- n>line</c-><c- p>);</c->
    <c- p>}</c->
    <c- k>if</c-> <c- p>(</c-><c- n>success</c-><c- p>)</c-> <c- p>{</c->
        <c- n>std</c-><c- o>::</c-><c- n>println</c-><c- p>(</c-><c- s>"Processed {}"</c-><c- p>,</c-> <c- n>text_file</c-><c- p>.</c-><c- n>path</c-><c- p>());</c->
    <c- p>}</c->
<c- p>}</c->
<c- n>std</c-><c- o>::</c-><c- n>println</c-><c- p>(</c-><c- s>"Processed all files"</c-><c- p>);</c->
</pre>
   <p>Works, but:</p>
   <ul>
    <li data-md>
     <p>More mutable state to keep track of.</p>
    <li data-md>
     <p>Way longer, extra <code class="highlight"><c- k>if</c-></code>.</p>
    <li data-md>
     <p>Needs one <code class="highlight"><c- b>bool</c-></code> peer loop, doesn’t scale.</p>
   </ul>
   <h3 class="heading settled" data-level="2.2" id="argumentum-ad-populum"><span class="secno">2.2. </span><span class="content">Argumentum ad populum</span><a class="self-link" href="#argumentum-ad-populum"></a></h3>
   <ul>
    <li data-md>
     <p><code class="highlight"><c- k>break</c-> <c- n>label</c-></code> and <code class="highlight"><c- k>continue</c-> <c- n>label</c-></code> very popular in other languages.</p>
    <li data-md>
     <p>This proposal: positive reception on Reddit.</p>
    <li data-md>
     <p>See poll below.</p>
   </ul>
   <blockquote>
     Should C++ have "break label" and "continue label" statements
to apply break/continue to nested loops or switches? 
    <table>
     <tbody>
      <tr>
       <td>SF
       <td>F
       <td>N
       <td>A
       <td>SA
      <tr>
       <td>21
       <td>21
       <td>12
       <td>6
       <td>4
    </table>
   </blockquote>
   <p>Source: Together C &amp; C++ (Discord server).</p>
   <table>
    <tbody>
     <tr>
      <td>Language
      <td>Syntax
      <td>Labeled<br><code class="highlight"><c- k>break</c-></code>s
      <td>Labeled<br><code class="highlight"><c- k>continue</c-></code>s
      <td>Σ <code class="highlight"><c- k>break</c-></code> <code class="highlight"><c- k>continue</c-></code>
      <td><code class="highlight"><c- k>goto</c-></code>s
     <tr>
      <td>Java
      <td><code class="highlight"><c- nl>label</c-><c- p>:</c-> <c- k>for</c-> <c- p>(...)</c-></code><br><code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code><br><code class="highlight"><c- k>continue</c-> <c- n>label</c-><c- p>;</c-></code>
      <td><a href="https://github.com/search?q=language%3AJava+%2F%28%3F-i%29break+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">424K files</a>
      <td><a href="https://github.com/search?q=language%3AJava+%2F%28%3F-i%29continue+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">152K files</a>
      <td>576K files
      <td>N/A
     <tr>
      <td>JavaScript
      <td><code class="highlight"><c- nl>label</c-><c- p>:</c-> <c- k>for</c-> <c- p>(...)</c-></code><br><code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code><br><code class="highlight"><c- k>continue</c-> <c- n>label</c-><c- p>;</c-></code>
      <td><a href="https://github.com/search?q=language%3AJavaScript+%2F%28%3F-i%29break+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">53.8K files</a>
      <td><a href="https://github.com/search?q=language%3AJavaScript+%2F%28%3F-i%29continue+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">68.7K files</a>
      <td>122.5K files
      <td>N/A
     <tr>
      <td>Perl
      <td><code class="highlight"><c- nl>label</c-><c- p>:</c-> <c- k>for</c-> <c- p>(...)</c-></code><br><code class="highlight"><c- n>last</c-> <c- n>label</c-><c- p>;</c-></code><br><code class="highlight"><c- n>next</c-> <c- n>label</c-><c- p>;</c-></code>
      <td><a href="https://github.com/search?q=language%3APerl+%2F%28%3F-i%29last+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">34.9K files</a>
      <td><a href="https://github.com/search?q=language%3APerl+%2F%28%3F-i%29next+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">31.7K files</a>
      <td>66.6K files
      <td><a href="https://github.com/search?q=language%3APerl+%2F%28%3F-i%29goto+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">16.9K files</a>
     <tr>
      <td>Rust
      <td><code class="highlight"><c- nl>label</c-><c- p>:</c-> <c- k>for</c-> <c- p>(...)</c-></code><br><code class="highlight"><c- k>break</c-> '<c- n>label</c-><c- p>;</c-></code><br><code class="highlight"><c- k>continue</c-> '<c- n>label</c-><c- p>;</c-></code>
      <td><a href="https://github.com/search?q=language%3ARust+%2F%28%3F-i%29break+%3F%27%5Ba-zA-Z0-9%5D%2B%3B%2F&amp;type=code">30.6K files</a>
      <td><a href="https://github.com/search?q=language%3ARust+%2F%28%3F-i%29continue+%3F%27%5Ba-zA-Z0-9%5D%2B%3B%2F&amp;type=code">29.1K files</a>
      <td>59.7K files
      <td>N/A
     <tr>
      <td>TypeScript
      <td><code class="highlight"><c- nl>label</c-><c- p>:</c-> <c- k>for</c-> <c- p>(...)</c-></code><br><code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code><br><code class="highlight"><c- k>continue</c-> <c- n>label</c-><c- p>;</c-></code>
      <td><a href="https://github.com/search?q=language%3ATypeScript+%2F%28%3F-i%29break+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">11.6K files</a>
      <td><a href="https://github.com/search?q=language%3ATypeScript+%2F%28%3F-i%29continue+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">9K files</a>
      <td>20.6K files
      <td>N/A
     <tr>
      <td>Swift
      <td><code class="highlight"><c- nl>label</c-><c- p>:</c-> <c- k>for</c-> <c- p>...</c-></code><br><code class="highlight"><c- k>break</c-> <c- n>label</c-></code><br><code class="highlight"><c- k>continue</c-> <c- n>label</c-></code>
      <td><a href="https://github.com/search?q=language%3ASwift+%2F%28%3F-i%29break+%5B_a-zA-Z0-9%5D%2B%5Cn%2F&amp;type=code">12.6K files</a>
      <td><a href="https://github.com/search?q=language%3ASwift+%2F%28%3F-i%29continue+%5B_a-zA-Z0-9%5D%2B%5Cn%2F&amp;type=code">5.6K files</a>
      <td>18.2K files
      <td>N/A
     <tr>
      <td>Kotlin
      <td><code class="highlight"><c- n>label</c->@ <c- k>for</c-> <c- p>(...)</c-></code><br><code class="highlight"><c- k>break</c->@<c- n>label</c-></code><br><code class="highlight"><c- k>continue</c->@<c- n>label</c-></code>
      <td><a href="https://github.com/search?q=language%3AKotlin+%2F%28%3F-i%29break%40%5B_a-zA-Z0-9%5D%2B%2F&amp;type=code">8.7K files</a>
      <td><a href="https://github.com/search?q=language%3AKotlin+%2F%28%3F-i%29continue%40%5B_a-zA-Z0-9%5D%2B%2F&amp;type=code">7.6K files</a>
      <td>16.3K files
      <td>N/A
     <tr>
      <td>D
      <td><code class="highlight"><c- nl>label</c-><c- p>:</c-> <c- k>for</c-> <c- p>(...)</c-></code><br><code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code><br><code class="highlight"><c- k>continue</c-> <c- n>label</c-><c- p>;</c-></code>
      <td><a href="https://github.com/search?q=language%3AD+%2F%28%3F-i%29break+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">3.5K files</a>
      <td><a href="https://github.com/search?q=language%3AD+%2F%28%3F-i%29continue+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">2.6K files</a>
      <td>6.1K files
      <td><a href="https://github.com/search?q=language%3AD+%2F%28%3F-i%29goto+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">12.3K files</a>
     <tr>
      <td>Go
      <td><code class="highlight"><c- nl>label</c-><c- p>:</c-> <c- k>for</c-> <c- p>...</c-></code><br><code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code><br><code class="highlight"><c- k>continue</c-> <c- n>label</c-><c- p>;</c-></code>
      <td><a href="https://github.com/search?q=language%3AGo+%2F%28%3F-i%29break+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">270 files</a>
      <td><a href="https://github.com/search?q=language%3AGo+%2F%28%3F-i%29continue+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">252 files</a>
      <td>522
      <td><a href="https://github.com/search?q=language%3AD+%2F%28%3F-i%29goto+%5Ba-zA-Z0-9%5D%2B%3B%2F&amp;type=code">1.5K files</a>
     <tr>
      <td>Cpp2 (cppfront)
      <td><code class="highlight"><c- nl>label</c-><c- p>:</c-> <c- k>for</c-> <c- p>...</c-></code><br><code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code><br><code class="highlight"><c- k>continue</c-> <c- n>label</c-><c- p>;</c-></code>
      <td>N/A
      <td>N/A
      <td>N/A
      <td>N/A
     <tr>
      <td>C
      <td><code class="highlight"><c- nl>label</c-><c- p>:</c-> <c- k>for</c-> <c- p>(...)</c-></code><br><code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code><br><code class="highlight"><c- k>continue</c-> <c- n>label</c-><c- p>;</c-></code>
      <td>N/A
      <td>N/A
      <td>N/A
      <td><a href="https://github.com/search?q=language%3AC+%2F%28%3F-i%29goto+%5B_a-zA-Z0-9%5D%2B%3B%2F&amp;type=code">7.8M files</a>
   </table>
   <h2 class="heading settled" data-level="3" id="design-considerations"><span class="secno">3. </span><span class="content">Design Considerations</span><a class="self-link" href="#design-considerations"></a></h2>
   <h3 class="heading settled" data-level="3.1" id="alternative-break-continue-forms"><span class="secno">3.1. </span><span class="content">Alternative <code class="highlight"><c- k>break</c-></code> and <code class="highlight"><c- k>continue</c-></code> forms</span><a class="self-link" href="#alternative-break-continue-forms"></a></h3>
   <ul>
    <li data-md>
     <p><code class="highlight"><c- k>break</c-> <c- n>N</c-></code> (e.g. <code class="highlight"><c- k>break</c-> <c- mi>2</c-><c- p>;</c-></code>)</p>
    <li data-md>
     <p><code class="highlight"><c- k>break</c-> <c- k>while</c-></code> (i.e. use keyword as label)</p>
    <li data-md>
     <p><code class="highlight"><c- k>break</c-> <c- n>statement</c-></code> (e.g. <code class="highlight"><c- k>break</c-> <c- k>break</c-><c- p>;</c-></code>)</p>
   </ul>
   <p>No, thanks!
Received poorly, too exotic.
WG14 wants <code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code>.</p>
   <h3 class="heading settled" data-level="3.2" id="constexpr-break-continue"><span class="secno">3.2. </span><span class="content"><code class="highlight"><c- k>constexpr</c-></code> <code class="highlight"><c- k>break</c-> <c- n>label</c-><c- p>;</c-></code> and <code class="highlight"><c- k>continue</c-> <c- n>label</c-><c- p>;</c-></code></span><a class="self-link" href="#constexpr-break-continue"></a></h3>
   <p>Yes, absolutely!
See motivation; easier to implement than <code class="highlight"><c- k>constexpr</c-> <c- k>goto</c-></code> because almost exists already:</p>
<pre class="language-cpp highlight"><c- k>while</c-> <c- p>(</c-><c- d>/* ... */</c-><c- p>)</c-> <c- p>{</c->
    <c- k>if</c-> <c- p>(</c-><c- d>/* ... */</c-><c- p>)</c-> <c- p>{</c->
        <c- p>{</c-> <c- p>{</c-> <c- p>{</c-> <c- p>{</c-> <c- p>{</c-> <c- k>break</c-><c- p>;</c-> <c- p>}</c-> <c- p>}</c-> <c- p>}</c-> <c- p>}</c-> <c- p>}</c->
    <c- p>}</c->
<c- p>}</c->
</pre>
   <ul>
    <li data-md>
     <p>Arbitrarily deeply nested <code class="highlight"><c- k>break</c-></code> already implemented.</p>
    <li data-md>
     <p><code class="highlight"><c- k>break</c-> <c- n>label</c-></code> just skips some statements and breaks more, easy.</p>
   </ul>
   <h3 class="heading settled" data-level="3.3" id="syntax"><span class="secno">3.3. </span><span class="content">Syntax warzone</span><a class="self-link" href="#syntax"></a></h3>
   <ul>
    <li data-md>
     <p>I like <a data-link-type="biblio" href="#biblio-n3355" title="N3355: Named loops, v3">[N3355]</a>, accepted into C2y.</p>
    <li data-md>
     <p>Competing proposal <a data-link-type="biblio" href="#biblio-n3377" title="N3377: Named Loops Should Name Their Loops: An Improved Syntax For N3355">[N3377]</a> seen at Graz, this month.</p>
   </ul>
   <p><a data-link-type="biblio" href="#biblio-n3377" title="N3377: Named Loops Should Name Their Loops: An Improved Syntax For N3355">[N3377]</a> syntax:</p>
<pre class="language-cpp highlight"><c- k>for</c-> <c- n>outer</c-> <c- p>(</c-><c- d>/* ...*/</c-><c- p>)</c-> <c- p>{</c->
    <c- k>while</c-> <c- p>(</c-><c- d>/* ... */</c-><c- p>)</c-> <c- k>break</c-> <c- n>outer</c-><c- p>;</c->
    <c- k>while</c-> <c- n>outer</c-> <c- p>(</c-><c- d>/* ... */</c-><c- p>)</c-> <c- p>{</c->
        <c- c1>// OK, applies to the enclosing while loop</c->
    <c- p>}</c->
<c- p>}</c->
</pre>
   <h4 class="heading settled" data-level="3.3.1" id="n3377-benefits"><span class="secno">3.3.1. </span><span class="content">N3377 benefits</span><a class="self-link" href="#n3377-benefits"></a></h4>
   <ul>
    <li data-md>
     <p><em>block-name</em>s don’t have to be unique, and this is good for macros.</p>
     <ul>
      <li data-md>
       <p>Counterpoint: I relax labels instead, no need for <a data-link-type="biblio" href="#biblio-n3377" title="N3377: Named Loops Should Name Their Loops: An Improved Syntax For N3355">[N3377]</a> syntax.</p>
     </ul>
    <li data-md>
     <p>Disambiguation between <code class="highlight"><c- k>goto</c-></code> targets and <code class="highlight"><c- k>break</c-></code> targets.</p>
     <ul>
      <li data-md>
       <p>Counterpoint: Impact may be overstated, could disambiguate with naming convention, linter scripts.</p>
     </ul>
   </ul>
   <p class="note" role="note"><span class="marker">Note:</span> There are some other minor arguments for <a data-link-type="biblio" href="#biblio-n3377" title="N3377: Named Loops Should Name Their Loops: An Improved Syntax For N3355">[N3377]</a>, but we don’t have the time.</p>
   <h4 class="heading settled" data-level="3.3.2" id="n3377-problems"><span class="secno">3.3.2. </span><span class="content">N3377 problems</span><a class="self-link" href="#n3377-problems"></a></h4>
   <h5 class="heading settled" data-level="3.3.2.1" id="against-n3377-breaking-precedent"><span class="secno">3.3.2.1. </span><span class="content">Breaking precedent of most prior art</span><a class="self-link" href="#against-n3377-breaking-precedent"></a></h5>
   <p>Breaks most prior art; see language stats above and examples below:</p>
   <p><strong>Perl:</strong></p>
<pre class="language-perl highlight">goto <c- n>LINE</c-><c- p>;</c->
<c- n>LINE:</c-> <c- k>while</c-> <c- p>(</c-><c- n>true</c-><c- p>)</c-> <c- p>{</c->
    <c- k>last</c-> <c- n>LINE</c-><c- p>;</c->  <c- c1># like our proposed break LINE</c->
<c- p>}</c->
</pre>
   <p><strong>Go:</strong></p>
<pre class="language-go highlight"><c- k>goto</c-> OuterLoop
OuterLoop<c- p>:</c-> <c- k>for</c-> <c- p>{</c->
    <c- k>break</c-> OuterLoop
<c- p>}</c->
</pre>
   <p><strong>D:</strong></p>
<pre class="language-d highlight"><c- k>goto</c-> <c- n>outer</c-><c- p>;</c->
<c- n>outer</c-><c- p>:</c-> <c- k>while</c-> <c- p>(</c-><c- kc>true</c-><c- p>)</c-> <c- p>{</c->
    <c- k>break</c-> <c- n>outer</c-><c- p>;</c->
<c- p>}</c->
</pre>
   <p>However, <strong>Ada:</strong></p>
<pre class="language-ada highlight"><c- kr>goto</c-> <c- n>Target</c-><c- p>;</c->
<c- nl>&lt;&lt;Target>></c->
<c- nl>Outer</c-><c- p>:</c-> <c- kr>loop</c->
    <c- kr>exit</c-> <c- n>Outer</c-><c- p>;</c-> <c- c1>-- like our proposed break Outer</c->
<c- kr>end</c-> <c- kr>loop</c-> <c- nf>Outer</c-><c- p>;</c->
</pre>
   <ul>
    <li data-md>
     <p><code class="highlight"><c- k>break</c-> <c- n>label</c-></code> and <code class="highlight"><c- k>continue</c-> <c- n>label</c-></code> has decades of precedent in other languages.</p>
    <li data-md>
     <p>C++ often used in conjunction with other languages, ergo common syntax = good.</p>
   </ul>
   <h5 class="heading settled" data-level="3.3.2.2" id="against-n3377-repetition"><span class="secno">3.3.2.2. </span><span class="content">Repetition</span><a class="self-link" href="#against-n3377-repetition"></a></h5>
   <p><a data-link-type="biblio" href="#biblio-n3377" title="N3377: Named Loops Should Name Their Loops: An Improved Syntax For N3355">[N3377]</a> is bad when loop is targeted by <code class="highlight"><c- k>break</c-></code> <em>and</em> <code class="highlight"><c- k>goto</c-></code>:</p>
<pre class="language-cpp highlight"><c- k>goto</c-> <c- n>outer</c-><c- p>;</c->
<c- c1>// ...</c->
<c- nl>outer</c-><c- p>:</c-> <c- k>while</c-> <c- n>outer</c-><c- p>(</c->true<c- p>)</c-> <c- p>{</c->
    <c- k>while</c-><c- p>(</c->true<c- p>)</c-> <c- p>{</c->
        <c- k>break</c-> <c- n>outer</c-><c- p>;</c->
    <c- p>}</c->
<c- p>}</c->
</pre>
   <ul>
    <li data-md>
     <p>Option A: copy/paste name, but DRY!</p>
    <li data-md>
     <p>Option B: two different names for same loop?!</p>
   </ul>
   <h5 class="heading settled" data-level="3.3.2.3" id="against-n3377-extendability"><span class="secno">3.3.2.3. </span><span class="content">Extendability</span><a class="self-link" href="#against-n3377-extendability"></a></h5>
<pre class="language-cpp highlight"><c- nl>label</c-><c- p>:</c-> <c- p>{</c->
    <c- c1>// OK in Java, JS, TS</c->
    <c- k>break</c-> <c- n>label</c-><c- p>;</c->
<c- p>}</c->
</pre>
   <ul>
    <li data-md>
     <p>Not proposed, but who knows next 40 years?</p>
    <li data-md>
     <p><a data-link-type="biblio" href="#biblio-n3377" title="N3377: Named Loops Should Name Their Loops: An Improved Syntax For N3355">[N3377]</a> syntax generally harder to apply to new features, more existing ones.</p>
   </ul>
   <h5 class="heading settled" data-level="3.3.2.4" id="against-n3377-keywords"><span class="secno">3.3.2.4. </span><span class="content">Blocking contextual keywords</span><a class="self-link" href="#against-n3377-keywords"></a></h5>
<pre class="language-cpp highlight"><c- k>while</c-> <c- n>parallel</c-><c- p>(</c-><c- d>/* ... */</c-><c- p>)</c->
</pre>
   <ul>
    <li data-md>
     <p><code class="highlight"><c- n>parallel</c-></code> cannot be contextual keyword if taken by user.</p>
    <li data-md>
     <p>Precedent: <code class="highlight"><c- k>if</c-> <c- k>constexpr</c-></code>.</p>
    <li data-md>
     <p>To be fair, <a data-link-type="biblio" href="#biblio-n3377" title="N3377: Named Loops Should Name Their Loops: An Improved Syntax For N3355">[N3377]</a> floats idea <code class="highlight"><c- nl>while</c-> <c- p>:</c-><c- n>parallel</c-><c- o>:</c-> <c- p>()</c-></code>.</p>
     <ul>
      <li data-md>
       <p>But then why not put label in front?</p>
     </ul>
   </ul>
   <h5 class="heading settled" data-level="3.3.2.5" id="against-n3377-macro-loops"><span class="secno">3.3.2.5. </span><span class="content">Labeling loops expanded from macros</span><a class="self-link" href="#against-n3377-macro-loops"></a></h5>
   <p>Example from uthash:</p>
<pre class="language-cpp highlight"><c- cp>#define HASH_ITER(hh,head,el,tmp) for (</c-><c- d>/* ... */</c-><c- cp>)</c->
</pre>
   <p>With <a data-link-type="biblio" href="#biblio-n3355" title="N3355: Named loops, v3">[N3355]</a>:</p>
<pre class="language-cpp highlight"><c- k>struct</c-> <c- nc>my_struct</c-> <c- o>*</c-><c- n>current_user</c-><c- p>,</c-> <c- o>*</c-><c- n>tmp</c-><c- p>;</c->

<c- nl>outer</c-><c- p>:</c-> <c- n>HASH_ITER</c-><c- p>(</c-><c- n>hh</c-><c- p>,</c-> <c- n>users</c-><c- p>,</c-> <c- n>current_user</c-><c- p>,</c-> <c- n>tmp</c-><c- p>)</c-> <c- p>{</c->
    <c- k>for</c-> <c- p>(</c-><c- d>/* ... */</c-><c- p>)</c-> <c- p>{</c->
        <c- k>if</c-> <c- p>(</c-><c- d>/* ... */</c-><c- p>)</c-> <c- k>break</c-> <c- n>outer</c-><c- p>;</c->
    <c- p>}</c->
<c- p>}</c->
</pre>
   <p>With <a data-link-type="biblio" href="#biblio-n3377" title="N3377: Named Loops Should Name Their Loops: An Improved Syntax For N3355">[N3377]</a>: ask library author to change macro or make your own.</p>
   <h3 class="heading settled" data-level="3.4" id="changes-to-labels"><span class="secno">3.4. </span><span class="content">Changes to labels</span><a class="self-link" href="#changes-to-labels"></a></h3>
   <p>As stated before, we relax labels as follows:</p>
<pre class="language-cpp highlight"><c- nl>outer</c-><c- p>:</c-> <c- k>while</c-> <c- p>(</c->true<c- p>)</c-> <c- p>{</c->
    <c- nl>inner</c-><c- p>:</c-> <c- k>while</c-> <c- p>(</c->true<c- p>)</c-> <c- p>{</c->
        <c- k>break</c-> <c- n>outer</c-><c- p>;</c-> <c- c1>// breaks enclosing outer while loop</c->
    <c- p>}</c->
<c- p>}</c->

<c- nl>outer</c-><c- p>:</c-> <c- k>while</c-> <c- p>(</c->true<c- p>)</c-> <c- p>{</c-> <c- c1>// OK, reusing label is permitted</c->
    <c- nl>inner</c-><c- p>:</c-> <c- k>while</c-> <c- p>(</c->true<c- p>)</c-> <c- p>{</c->
        <c- k>break</c-> <c- n>outer</c-><c- p>;</c-> <c- c1>// breaks enclosing outer while loop</c->
    <c- p>}</c->
<c- p>}</c->

<c- k>goto</c-> <c- n>outer</c-><c- p>;</c-> <c- c1>// error: ambiguous jump target</c->
</pre>
   <ul>
    <li data-md>
     <p>OK in Java and JavaScript.</p>
    <li data-md>
     <p>With <code class="highlight">'<c- n>outer</c-></code> and <code class="highlight">'<c- n>inner</c-></code> instead, this code is OK Rust.</p>
   </ul>
   <h4 class="heading settled" data-level="3.4.1" id="new-labels-goto"><span class="secno">3.4.1. </span><span class="content">New labels - <code class="highlight"><c- k>goto</c-></code></span><a class="self-link" href="#new-labels-goto"></a></h4>
<pre class="language-cpp highlight"><c- nl>x</c-><c- p>:</c-> <c- n>f</c-><c- p>();</c-> <c- c1>// OK</c->
<c- nl>x</c-><c- p>:</c-> <c- n>g</c-><c- p>();</c-> <c- c1>// OK</c->
<c- k>goto</c-> <c- n>x</c-><c- p>;</c-> <c- c1>// error: jump is ambiguous</c->
</pre>
   <p>No existing code broken.</p>
   <h4 class="heading settled" data-level="3.4.2" id="new-labels-nesting"><span class="secno">3.4.2. </span><span class="content">New labels - nesting?</span><a class="self-link" href="#new-labels-nesting"></a></h4>
   <p>Another case to consider is the following:</p>
<pre class="language-cpp highlight"><c- nl>l</c-><c- p>:</c-> <c- k>while</c-> <c- p>(</c->true<c- p>)</c-> <c- p>{</c->
    <c- nl>l</c-><c- p>:</c-> <c- k>for</c-> <c- p>(</c->true<c- p>)</c-> <c- p>{</c-> <c- c1>// OK</c->
        <c- k>break</c-> <c- n>l</c-><c- p>;</c-> <c- c1>// breaks for loop</c->
    <c- p>}</c->
<c- p>}</c->
</pre>
   <ul>
    <li data-md>
     <p>OK in Rust <code class="highlight">'<c- n>l</c-></code>, but not in JS, Java.</p>
    <li data-md>
     <p>Motivation: macros.</p>
   </ul>
   <h4 class="heading settled" data-level="3.4.3" id="new-labels-duplicates"><span class="secno">3.4.3. </span><span class="content">New labels - direct duplicates?</span><a class="self-link" href="#new-labels-duplicates"></a></h4>
<pre class="language-cpp highlight"><c- nl>l</c-><c- p>:</c-> <c- n>l</c-><c- o>:</c-> <c- n>l</c-><c- o>:</c-> <c- n>l</c-><c- o>:</c-> <c- k>for</c-><c- p>();</c-> <c- c1>// OK</c->
</pre>
   <ul>
    <li data-md>
     <p>Motivation:</p>
     <ul>
      <li data-md>
       <p>Why not?</p>
      <li data-md>
       <p>Macros.</p>
     </ul>
   </ul>
   <h4 class="heading settled" data-level="3.4.4" id="new-labels-break-label-multiple"><span class="secno">3.4.4. </span><span class="content">New labels - what about <code class="highlight"><c- k>break</c-> <c- n>label</c-></code> for loops with more than one label?</span><a class="self-link" href="#new-labels-break-label-multiple"></a></h4>
<pre class="language-cpp highlight"><c- nl>x</c-><c- p>:</c-> <c- n>y</c-><c- o>:</c-> <c- k>while</c-> <c- p>(</c->true<c- p>)</c-> <c- p>{</c->
    <c- k>break</c-> <c- n>x</c-><c- p>;</c-> <c- c1>// OK</c->
<c- p>}</c->
</pre>
   <ul>
    <li data-md>
     <p>Motivation: OK in C2y (<a data-link-type="biblio" href="#biblio-n3355" title="N3355: Named loops, v3">[N3355]</a> and <a data-link-type="biblio" href="#biblio-n3377" title="N3377: Named Loops Should Name Their Loops: An Improved Syntax For N3355">[N3377]</a>(?)).</p>
   </ul>
   <h2 class="heading settled" data-level="4" id="impact-on-existing-code"><span class="secno">4. </span><span class="content">Impact on existing code</span><a class="self-link" href="#impact-on-existing-code"></a></h2>
   <p>None.</p>
   <h2 class="heading settled" data-level="5" id="implementation-experience"><span class="secno">5. </span><span class="content">Implementation experience</span><a class="self-link" href="#implementation-experience"></a></h2>
   <ul>
    <li data-md>
     <p>Tons of other languages have this; it works.</p>
    <li data-md>
     <p>A GCC implementation of <a data-link-type="biblio" href="#biblio-n3355" title="N3355: Named loops, v3">[N3355]</a></p>
    <li data-md>
     <p>An LLVM implementation is W.I.P.</p>
   </ul>
   <h2 class="heading settled" data-level="6" id="proposed-wording"><span class="secno">6. </span><span class="content">Proposed wording</span><a class="self-link" href="#proposed-wording"></a></h2>
   <p>The wording is relative to <a data-link-type="biblio" href="#biblio-n5001" title="Working Draft, Programming Languages — C++">[N5001]</a>.</p>
   <p>Update <a href="https://eel.is/c++draft/stmt.label">[stmt.label]</a> paragraph 1 as follows:</p>
   <blockquote>
     A label can be added to a statement or used anywhere in a <em>compound-statement</em>. 
    <div class="indent">
      <em>label</em>:<br> 
     <div class="indent"> <em>attribute-specifier-seq</em><sub>opt</sub> <em>identifier</em> <code class="highlight"><c- o>:</c-></code><br> <em>attribute-specifier-seq</em><sub>opt</sub> <code class="highlight"><c- k>case</c-></code> <em>constant-expression</em> <code class="highlight"><c- o>:</c-></code><br> <em>attribute-specifier-seq</em><sub>opt</sub> <code class="highlight"><c- k>default</c-></code> <code class="highlight"><c- o>:</c-></code> </div>
      <em>labeled-statement</em>:<br> 
     <div class="indent"> <em>label</em> <em>statement</em> </div>
    </div>
     The optional <em>attribute-specifier-seq</em> appertains to the label. 
    <del>The only use of a label with an <em>identifier</em> is as the target of a <code class="highlight"><c- k>goto</c-></code>.
No two labels in a function shall have the same identifier.</del>
     A label can be used in a <code class="highlight"><c- k>goto</c-></code> statement 
    <ins>([stmt.goto])</ins>
     before its introduction.
    <ins><br><br> [ <em>Note</em>: Multiple identical labels within the same function are permitted,
    but such duplicate labels cannot be used in a <code class="highlight"><c- k>goto</c-></code> statement. — <em>end note</em> ] </ins>
   </blockquote>
   <p>In <a href="https://eel.is/c++draft/stmt.label">[stmt.label]</a> insert a new paragraph after paragraph 1:</p>
   <blockquote>
    <ins>
     A label <strong>L</strong> of the form <em>attribute-specifier-seq</em><sub>opt</sub> <em>identifier</em> <code class="highlight"><c- o>:</c-></code> <em>labels</em> a <em>statement</em> <strong>S</strong> if 
     <ul>
      <li><strong>L</strong> is the <em>label</em> and <strong>S</strong> is the <em>statement</em> of a <em>labeled-statement</em> <strong>X</strong>, or
      <li><strong>L</strong> labels <strong>X</strong> (recursively).
     </ul>
    </ins>
    <div class="ins-block">
      [ <em>Example</em>: 
<pre class="highlight"><c- nl>a</c-><c- p>:</c-> <c- n>b</c-><c- o>:</c-> <c- k>while</c-> <c- p>(</c-><c- mi>0</c-><c- p>)</c-> <c- p>{</c-> <c- p>}</c->            <c- c1>// both a: and b: label the loop</c->
<c- nl>c</c-><c- p>:</c-> <c- p>{</c-> <c- n>d</c-><c- o>:</c-> <c- k>switch</c-> <c- p>(</c-><c- mi>0</c-><c- p>)</c-> <c- p>{</c->           <c- c1>// unlike c:, d: labels the switch statement</c->
    <c- k>default</c-><c- o>:</c-> <c- k>while</c-> <c- p>(</c-><c- mi>0</c-><c- p>)</c-> <c- p>{</c-> <c- p>}</c->     <c- c1>// default: labels nothing</c->
<c- p>}</c-> <c- p>}</c->
</pre>
     — <em>end example</em> ]
    </div>
   </blockquote>
   <p class="note" role="note"><span class="marker">Note:</span> This defines the term <em>(to) label</em>, which is used extensively below.
We also don’t want <code class="highlight"><c- k>case</c-></code> or <code class="highlight"><c- k>default</c-></code> labels to label statements, since this would inadvertently
permit <code class="highlight"><c- k>break</c-> <c- n>i</c-></code> given <code class="highlight"><c- k>case</c-> <c- no>i</c-><c- p>:</c-></code>, considering how we word [stmt.break].</p>
   <p>Update <a href="https://eel.is/c++draft/stmt.label">[stmt.label]</a> paragraph 3 as follows:</p>
   <blockquote>
     A <em>control-flow-limited statement</em> is a statement <strong>S</strong> for which: 
    <ul>
     <li> a <code class="highlight"><c- k>case</c-></code> or <code class="highlight"><c- k>default</c-></code> label appearing within <strong>S</strong> shall be associated with a <code class="highlight"><c- k>switch</c-></code> statement ([stmt.switch]) within <strong>S</strong>, and 
     <li>
       a label declared in <strong>S</strong> shall only be
        referred to by a statement 
      <del>([stmt.goto])</del>
       in <strong>S</strong>. 
    </ul>
   </blockquote>
   <p class="note" role="note"><span class="marker">Note:</span> While the restriction still primarily applies to <code class="highlight"><c- k>goto</c-></code> (preventing the user from e.g. jumping into an <code class="highlight"><c- k>if</c-> <c- k>constexpr</c-></code> statement),
if other statements can also refer to labels, it is misleading to say
"statement ([stmt.goto])" as if <code class="highlight"><c- k>goto</c-></code> was the only relevant statement.</p>
   <hr>
   <p>Update <a href="https://eel.is/c++draft/stmt.jump.general">[stmt.jump.general]</a> paragraph 1 as follows:</p>
   <blockquote>
     Jump statements unconditionally transfer control. 
    <div class="indent">
      <em>jump-statement</em>: 
     <div class="indent">
      <ins><code class="highlight"><c- k>goto</c-></code> <em>identifier</em> <code class="highlight"><c- p>;</c-></code></ins>
      <br> <code class="highlight"><c- k>break</c-></code> 
      <ins><em>identifier</em><sub>opt</sub></ins>
       <code class="highlight"><c- p>;</c-></code><br> <code class="highlight"><c- k>continue</c-></code> 
      <ins><em>identifier</em><sub>opt</sub></ins>
       <code class="highlight"><c- p>;</c-></code><br> <code class="highlight"><c- k>return</c-></code> <em>expr-or-braced-init-list</em><sub>opt</sub> <code class="highlight"><c- p>;</c-></code><br> 
      <del><code class="highlight"><c- k>goto</c-></code> <em>identifier</em> <code class="highlight"><c- p>;</c-></code></del>
      <br> 
     </div>
    </div>
   </blockquote>
   <p class="note" role="note"><span class="marker">Note:</span> <code class="highlight"><c- k>goto</c-></code> is being relocated to the top so that all the jump statements with an <em>identifier</em> are grouped together.
Of these three, <code class="highlight"><c- k>goto</c-></code> is being listed first because it models the concept of
"jumping somewhere" most literally; every following statement is more sophisticated or even
defined as equivalent to <code class="highlight"><c- k>goto</c-></code> (in the case of <code class="highlight"><c- k>continue</c-></code>).</p>
   <hr>
   <p>Update <a href="https://eel.is/c++draft/stmt.break">[stmt.break]</a> paragraph 1 as follows:</p>
   <blockquote>
    <ins>A <em>breakable statement</em> is
an <em>iteration-statement</em> ([stmt.iter]) or a <code class="highlight"><c- k>switch</c-></code> statement ([stmt.switch]).</ins>
     A <code class="highlight"><c- k>break</c-></code> statement shall be enclosed by ([stmt.pre]) 
    <ins>a breakable statement</ins>
    <del>an <em>iteration-statement</em> ([stmt.iter]) or a <code class="highlight"><c- k>switch</c-></code> statement ([stmt.switch])</del>
    . 
    <ins>If present, the <em>identifier</em> shall be part of a label <strong>L</strong> which labels ([stmt.label]) an enclosing breakable statement.</ins>
     The <code class="highlight"><c- k>break</c-></code> statement causes termination of
    <ins>:</ins>
    <del>the smallest such enclosing statement;</del>
    <ul>
     <li>
      <ins>if an <em>identifier</em> is present, the smallest enclosing breakable statement labeled by <strong>L</strong>,</ins>
     <li>
      <ins>otherwise, the smallest enclosing breakable statement.</ins>
    </ul>
    <del>control</del>
    <ins>Control</ins>
     passes to the statement following the terminated statement, if any. <br><br> 
    <div class="ins-block">
      [ <em>Example</em>: 
<pre class="highlight"><c- nl>a</c-><c- p>:</c-> <c- n>b</c-><c- o>:</c-> <c- k>while</c-> <c- p>(</c-><c- d>/* ... */</c-><c- p>)</c-> <c- p>{</c->
    <c- nl>a</c-><c- p>:</c-> <c- n>a</c-><c- o>:</c-> <c- n>c</c-><c- o>:</c-> <c- k>for</c-> <c- p>(</c-><c- d>/* ... */</c-><c- p>)</c-> <c- p>{</c->
        <c- k>break</c-><c- p>;</c->              <c- c1>// OK, terminates enclosing for loop</c->
        <c- k>break</c-> <c- n>a</c-><c- p>;</c->            <c- c1>// OK, same</c->
        <c- k>break</c-> <c- n>b</c-><c- p>;</c->            <c- c1>// OK, terminates enclosing while loop</c->
        <c- nl>y</c-><c- p>:</c-> <c- p>{</c-> <c- k>break</c-> <c- n>y</c-><c- p>;</c-> <c- p>}</c->     <c- c1>// error: break does not refer to a breakable statement</c->
    <c- p>}</c->
    <c- k>break</c-> <c- n>c</c-><c- p>;</c->                <c- c1>// error: break does not refer to an enclosing statement</c->
<c- p>}</c->
<c- k>break</c-><c- p>;</c->                      <c- c1>// error: break must be enclosed by a breakable statement</c->
</pre>
     — <em>end example</em> ]
    </div>
   </blockquote>
   <hr>
   <p>Update <a href="https://eel.is/c++draft/stmt.cont">[stmt.cont]</a> paragraph 1 as follows:</p>
   <blockquote>
     A <code class="highlight"><c- k>continue</c-></code> statement shall be enclosed by ([stmt.pre]) an <em>iteration-statement</em> ([stmt.iter]). 
    <ins>If present, the <em>identifier</em> shall be part of a label <strong>L</strong> which labels ([stmt.label]) an enclosing <em>iteration-statement</em>.</ins>
     The <code class="highlight"><c- k>continue</c-></code> statement causes control to pass to the loop-continuation portion of
    <ins>:</ins>
    <del>the smallest such enclosing statement, that is, to the end of the loop.</del>
    <ul>
     <li>
      <ins>if an <em>identifier</em> is present, the smallest enclosing <em>iteration-statement</em> labeled by <strong>L</strong>,</ins>
     <li>
      <ins>otherwise, the smallest enclosing <em>iteration-statement</em>.</ins>
    </ul>
     More precisely, in each of the statements 
<pre class="highlight"><ins><c- nl>label</c-><c- p>:</c-> </ins><c- k>while</c-> <c- p>(</c-><c- n>foo</c-><c- p>)</c-> <c- p>{</c->
  <c- p>{</c->
    <c- c1>// ...</c->
  <c- p>}</c->
<c- nl>contin</c-><c- p>:</c-> <c- p>;</c->
<c- p>}</c->

<ins><c- nl>label</c-><c- p>:</c-> </ins><c- k>do</c-> <c- p>{</c->
  <c- p>{</c->
    <c- c1>// ...</c->
  <c- p>}</c->
<c- nl>contin</c-><c- p>:</c-> <c- p>;</c->
<c- p>}</c-> <c- k>while</c-> <c- p>(</c-><c- n>foo</c-><c- p>);</c->

<ins><c- nl>label</c-><c- p>:</c-> </ins><c- k>for</c-> <c- p>(;;)</c-> <c- p>{</c->
  <c- p>{</c->
    <c- c1>// ...</c->
  <c- p>}</c->
<c- nl>contin</c-><c- p>:</c-> <c- p>;</c->
<c- p>}</c->
</pre>
    <del>a <code class="highlight"><c- k>continue</c-></code> not contained in an an enclosed iteration statement is equivalent to <code class="highlight"><c- k>goto</c-> <c- n>contin</c-></code>.</del>
    <ins>
     the following are equivalent to <code class="highlight"><c- k>goto</c-> <c- n>contin</c-></code>: 
     <ul>
      <li>A <code class="highlight"><c- k>continue</c-></code> not contained in an an enclosed iteration statement.
      <li>A <code class="highlight"><c- k>continue</c-> <c- n>label</c-></code> not contained in an enclosed iteration statement labeled <code class="highlight"><c- nl>label</c-><c- p>:</c-></code>.
     </ul>
    </ins>
   </blockquote>
   <hr>
   <p>Update <a href="https://eel.is/c++draft/stmt.goto">[stmt.goto]</a> paragraph 1 as follows:</p>
   <blockquote>
     The <code class="highlight"><c- k>goto</c-></code> statement unconditionally transfers control to 
    <del>the</del>
    <ins>a</ins>
     statement
labeled 
    <ins>([stmt.label])</ins>
     by 
    <del>the identifier</del>
    <ins>a label in the current function containing <em>identifier</em>, but not to a <code class="highlight"><c- k>case</c-></code> label</ins>
    . 
    <del>The identifier shall be a label located in the current function.</del>
    <ins>There shall be exactly one such label.</ins>
   </blockquote>
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  <h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="#references"></a></h2>
  <h3 class="no-num no-ref heading settled" id="normative"><span class="content">Normative References</span><a class="self-link" href="#normative"></a></h3>
  <dl>
   <dt id="biblio-n5001">[N5001]
   <dd>Thomas Köppe. <a href="https://wg21.link/n5001"><cite>Working Draft, Programming Languages — C++</cite></a>. 17 December 2024. URL: <a href="https://wg21.link/n5001">https://wg21.link/n5001</a>
  </dl>
  <h3 class="no-num no-ref heading settled" id="informative"><span class="content">Informative References</span><a class="self-link" href="#informative"></a></h3>
  <dl>
   <dt id="biblio-n3355">[N3355]
   <dd>Alex Celeste. <a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3355.htm"><cite>N3355: Named loops, v3</cite></a>. 2024-09-18. URL: <a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3355.htm">https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3355.htm</a>
   <dt id="biblio-n3377">[N3377]
   <dd>Erich Keane. <a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3377.pdf"><cite>N3377: Named Loops Should Name Their Loops: An Improved Syntax For N3355</cite></a>. URL: <a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3377.pdf">https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3377.pdf</a>
   <dt id="biblio-n3879">[N3879]
   <dd>Andrew Tomazos. <a href="https://wg21.link/n3879"><cite>Explicit Flow Control: break label, goto case and explicit switch</cite></a>. 16 January 2014. URL: <a href="https://wg21.link/n3879">https://wg21.link/n3879</a>
   <dt id="biblio-n4327">[N4327]
   <dd>Ville Voutilanen. <a href="https://wg21.link/n4327"><cite>C++ Standard Evolution Closed Issues List (Revision R10)</cite></a>. 21 November 2014. URL: <a href="https://wg21.link/n4327">https://wg21.link/n4327</a>
   <dt id="biblio-p3568r0">[P3568R0]
   <dd>Jan Schultke, Sarah Quiñones. <a href="https://wg21.link/p3568r0"><cite>break label; and continue label;</cite></a>. 12 January 2025. URL: <a href="https://wg21.link/p3568r0">https://wg21.link/p3568r0</a>
  </dl>