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spec: disallow unused labels

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Also change labelled examples to use gofmt formatting.

R=gri, r, jnml
CC=golang-dev
https://golang.org/cl/4287046
This commit is contained in:
Russ Cox 2011-03-15 13:51:24 -04:00
parent f192891786
commit 108564dabc
1 changed files with 10 additions and 7 deletions
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17
doc/go_spec.html
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@ -1,5 +1,5 @@
<!-- title The Go Programming Language Specification --> <!-- title The Go Programming Language Specification -->
<!-- subtitle Version of March 11, 2011 --> <!-- subtitle Version of March 15, 2011 -->
<!-- <!--
TODO TODO
@ -1472,6 +1472,7 @@ declarations.
Labels are declared by <a href="#Labeled_statements">labeled statements</a> and are Labels are declared by <a href="#Labeled_statements">labeled statements</a> and are
used in the <code>break</code>, <code>continue</code>, and <code>goto</code> used in the <code>break</code>, <code>continue</code>, and <code>goto</code>
statements (§<a href="#Break_statements">Break statements</a>, §<a href="#Continue_statements">Continue statements</a>, §<a href="#Goto_statements">Goto statements</a>). statements (§<a href="#Break_statements">Break statements</a>, §<a href="#Continue_statements">Continue statements</a>, §<a href="#Goto_statements">Goto statements</a>).
It is illegal to define a label that is never used.
In contrast to other identifiers, labels are not block scoped and do In contrast to other identifiers, labels are not block scoped and do
not conflict with identifiers that are not labels. The scope of a label not conflict with identifiers that are not labels. The scope of a label
is the body of the function in which it is declared and excludes is the body of the function in which it is declared and excludes
@ -4256,11 +4257,13 @@ terminates
</p> </p>
<pre> <pre>
L: for i &lt; n { L:
switch i { for i &lt; n {
case 5: break L switch i {
case 5:
break L
}
} }
}
</pre> </pre>
<h3 id="Continue_statements">Continue statements</h3> <h3 id="Continue_statements">Continue statements</h3>
@ -4302,8 +4305,8 @@ instance, this example:
</p> </p>
<pre> <pre>
goto L // BAD goto L // BAD
v := 3 v := 3
L: L:
</pre> </pre>