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spec: clarify default "true" condition/tag in for/switch statements

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An absent condition/tag in for and switch statements is equivalent
to the predeclared constant true; not simply the expression true
(which might lead to a locally defined true).

Not a language change.

Fixes #7404.

LGTM=iant, r
R=r, iant, rsc, ken
CC=golang-codereviews
https://golang.org/cl/68150046
This commit is contained in:
Robert Griesemer 2014-02-25 09:13:37 -08:00
parent 5b35dc0f6f
commit ab26623182
1 changed files with 7 additions and 5 deletions
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12
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of Jan 14, 2014",
"Subtitle": "Version of Feb 25, 2014",
"Path": "/ref/spec"
}-->
@ -4459,8 +4459,8 @@ If no case matches and there is a "default" case,
its statements are executed.
There can be at most one default case and it may appear anywhere in the
"switch" statement.
A missing switch expression is equivalent to
the expression <code>true</code>.
A missing switch expression is equivalent to the boolean value
<code>true</code>.
</p>
<pre class="ebnf">
@ -4625,7 +4625,8 @@ Condition = Expression .
In its simplest form, a "for" statement specifies the repeated execution of
a block as long as a boolean condition evaluates to true.
The condition is evaluated before each iteration.
If the condition is absent, it is equivalent to <code>true</code>.
If the condition is absent, it is equivalent to the boolean value
<code>true</code>.
</p>
<pre>
@ -4662,7 +4663,8 @@ only if the block was executed).
Any element of the ForClause may be empty but the
<a href="#Semicolons">semicolons</a> are
required unless there is only a condition.
If the condition is absent, it is equivalent to <code>true</code>.
If the condition is absent, it is equivalent to the boolean value
<code>true</code>.
</p>
<pre>