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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 -->
<!-- subtitle Version of March 11, 2011 -->
<!-- subtitle Version of March 15, 2011 -->
<!--
TODO
@ -1472,6 +1472,7 @@ declarations.
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>
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
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
@ -4256,11 +4257,13 @@ terminates
</p>
<pre>
L: for i &lt; n {
switch i {
case 5: break L
L:
for i &lt; n {
switch i {
case 5:
break L
}
}
}
</pre>
<h3 id="Continue_statements">Continue statements</h3>
@ -4302,8 +4305,8 @@ instance, this example:
</p>
<pre>
goto L // BAD
v := 3
goto L // BAD
v := 3
L:
</pre>