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go spec: inside functions, variables must be evaluated.

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Fixes #1612.

R=r, rsc, iant, ken, remyoudompheng, ken, r
CC=golang-dev
https://golang.org/cl/5700068
This commit is contained in:
Robert Griesemer 2012-02-28 17:44:24 -08:00
parent b69fa69a8b
commit 2c9e1637d2
1 changed files with 13 additions and 4 deletions
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17
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{ <!--{
"Title": "The Go Programming Language Specification", "Title": "The Go Programming Language Specification",
"Subtitle": "Version of February 23, 2012" "Subtitle": "Version of February 28, 2012"
}--> }-->
<!-- <!--
@ -1832,6 +1832,13 @@ of the expression list.
If the type is absent and the corresponding expression evaluates to an If the type is absent and the corresponding expression evaluates to an
untyped <a href="#Constants">constant</a>, the type of the declared variable untyped <a href="#Constants">constant</a>, the type of the declared variable
is as described in §<a href="#Assignments">Assignments</a>. is as described in §<a href="#Assignments">Assignments</a>.
</p>
<p>
Implementation restriction: A compiler may make it illegal to declare a variable
inside a <a href="#Function_declarations">function body</a> if the variable is
never used.
</p>
<h3 id="Short_variable_declarations">Short variable declarations</h3> <h3 id="Short_variable_declarations">Short variable declarations</h3>
@ -1844,8 +1851,8 @@ ShortVarDecl = IdentifierList ":=" ExpressionList .
</pre> </pre>
<p> <p>
It is a shorthand for a regular variable declaration with It is a shorthand for a regular <a href="#Variable_declarations">variable declaration</a>
initializer expressions but no types: with initializer expressions but no types:
</p> </p>
<pre class="grammar"> <pre class="grammar">
@ -4238,7 +4245,9 @@ iteration variables as in an <a href="#Assignments">assignment statement</a>.
</p> </p>
<p> <p>
The iteration variables may be declared by the "range" clause (<code>:=</code>). The iteration variables may be declared by the "range" using a form of
<a href="#Short_variable_declarations">short variable declaration</a>
(<code>:=</code>).
In this case their types are set to the types of the respective iteration values In this case their types are set to the types of the respective iteration values
and their <a href="#Declarations_and_scope">scope</a> ends at the end of the "for" and their <a href="#Declarations_and_scope">scope</a> ends at the end of the "for"
statement; they are re-used in each iteration. statement; they are re-used in each iteration.