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spec: clarify short variable declaration corner cases

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Fixes #4612.

R=rsc, iant, ken, r
CC=golang-dev
https://golang.org/cl/7076043
This commit is contained in:
Robert Griesemer 2013-01-09 11:31:32 -08:00
parent be36ab339f
commit f1cc0f44e3
1 changed files with 3 additions and 2 deletions
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5
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of January 7, 2013",
"Subtitle": "Version of January 9, 2013",
"Path": "/ref/spec"
}-->
@ -1920,7 +1920,7 @@ _, y, _ := coord(p) // coord() returns three values; only interested in y coord
<p>
Unlike regular variable declarations, a short variable declaration may redeclare variables provided they
were originally declared in the same block with the same type, and at
were originally declared earlier in the same block with the same type, and at
least one of the non-<a href="#Blank_identifier">blank</a> variables is new. As a consequence, redeclaration
can only appear in a multi-variable short declaration.
Redeclaration does not introduce a new
@ -1930,6 +1930,7 @@ variable; it just assigns a new value to the original.
<pre>
field1, offset := nextField(str, 0)
field2, offset := nextField(str, offset) // redeclares offset
a, a := 1, 2 // illegal: double declaration of a or no new variable if a was declared elsewhere
</pre>
<p>