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spec change for redeclaration

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R=iant,gri
DELTA=14  (14 added, 0 deleted, 0 changed)
OCL=27615
CL=27618
This commit is contained in:
Rob Pike 2009-04-19 20:04:15 -07:00
parent 549a60046b
commit 2a1683a007
1 changed files with 14 additions and 0 deletions
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doc/go_spec.html
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@ -1674,6 +1674,20 @@ variables will be assigned the corresponding values.
r, w := os.Pipe(fd); // os.Pipe() returns two values
</pre>
<p>
A short variable declaration may redeclare variables provided they
were originally declared in the same block with the same type, and at
least one of the variables is new. As a consequence, redeclaration
can only appear in a multi-variable short declaration.
Redeclaration does not introduce a new
variable; it just assigns a new value to the original.
</p>
<pre>
field1, offset := nextField(str, 0);
field2, offset := nextField(str, offset); // redeclares offset
</pre>
<p>
Short variable declarations may appear only inside functions.
In some contexts such as the initializers for <code>if</code>,