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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, and a <i>post</i> statement, such as an assignment,
an increment or decrement statement. The init statement may be a 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. <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> </p>
<pre class="ebnf"> <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> <a href="#Short_variable_declarations">short variable declaration</a>
(<code>:=</code>). (<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> is the block of the "for"
statement; they are re-used in each iteration. statement; they are re-used in each iteration.
If the iteration variables are declared outside the "for" statement, If the iteration variables are declared outside the "for" statement,
after execution their values will be those of the last iteration. after execution their values will be those of the last iteration.