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spec: clarify scope and re-use of iteration variables

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Fixes #7834.

LGTM=iant, rsc, r
R=r, rsc, iant, ken
CC=golang-codereviews
https://golang.org/cl/148940044
This commit is contained in:
Robert Griesemer 2014-09-25 12:52:05 -07:00
parent bb29c5a1ed
commit 2fa3e43fae
1 changed files with 2 additions and 1 deletions
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doc/go_spec.html
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@ -4682,6 +4682,7 @@ additionally it may specify an <i>init</i>
and a <i>post</i> statement, such as an assignment,
an increment or decrement statement. The init statement may be a
<a href="#Short_variable_declarations">short variable declaration</a>, but the post statement must not.
Variables declared by the init statement are re-used in each iteration.
</p>
<pre class="ebnf">
@ -4808,7 +4809,7 @@ The iteration variables may be declared by the "range" clause 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
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> is the block of the "for"
statement; they are re-used in each iteration.
If the iteration variables are declared outside the "for" statement,
after execution their values will be those of the last iteration.