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The final piece of the alternative to my parens proposal

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(i.e., the status quo with braces in composite literals).

DELTA=20  (16 added, 0 deleted, 4 changed)
OCL=25640
CL=25646
This commit is contained in:
Russ Cox 2009-03-03 15:40:30 -08:00
parent 49cc649e59
commit 7a5e97ba91
1 changed files with 20 additions and 4 deletions
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24
doc/go_spec.html
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@ -1875,10 +1875,11 @@ ExprPair = Expression ":" Expression .
<p> <p>
The LiteralType must be a struct, array, slice, or map type. The LiteralType must be a struct, array, slice, or map type.
<font color=red>TODO: then why doesn't the grammar say that?</font> (The grammar enforces this constraint except when the type is given
The types of the expressions must match the respective field, element, and as a TypeName.)
key types of the LiteralType; there is no automatic type conversion. The types of the expressions must be assignment compatible to
Given the respective field, element, and key types of the LiteralType;
there is no additional conversion.
</p> </p>
<pre> <pre>
@ -1936,6 +1937,21 @@ key-value pairs separated by a colon:
m := map[string]int{"good": 0, "bad": 1, "indifferent": 7}; m := map[string]int{"good": 0, "bad": 1, "indifferent": 7};
</pre> </pre>
<p>
A parsing ambiguity arises when a composite literal using the
TypeName form of the LiteralType appears in the condition of an
"if", "for", or "switch" statement, because the braces surrounding
the expressions in the literal are confused with those introducing
a block of statements. To resolve the ambiguity in this rare case,
the composite literal must appear within
parentheses.
</p>
<pre>
if x == (T{a,b,c}[i]) { ... }
if (x == T{a,b,c}[i]) { ... }
</pre>
<h3>Function literals</h3> <h3>Function literals</h3>
<p> <p>