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go_spec: use PrimaryExpr as type switch expression

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Without this change, the spec parses <-c.(type) as (<-c).(type)
but parses <-c.(int) as <-(c.(int)).

With this change, the former parses as <-(c.(type)).

All three parsers already implement this rule, because
they look for the "type" word during parsing of a standard
type assertion.  This change merely brings the
spec in line with the implementations.

http://code.google.com/p/go/source/browse/src/cmd/gc/go.y#801
http://code.google.com/p/go/source/browse/src/pkg/go/parser/parser.go#900
http://gcc.gnu.org/viewcvs/branches/gccgo/gcc/go/parse.cc?revision=155389&view=markup#l2469

Pointed out by Brett Kail on golang-nuts.

R=gri
CC=golang-dev
https://golang.org/cl/182044
This commit is contained in:
Russ Cox 2009-12-23 13:48:44 -08:00
parent e1033d07b4
commit c1045db1d8
1 changed files with 1 additions and 1 deletions
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doc/go_spec.html
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@ -3611,7 +3611,7 @@ in the type assertion.
<pre class="ebnf">
TypeSwitchStmt = "switch" [ SimpleStmt ";" ] TypeSwitchGuard "{" { TypeCaseClause } "}" .
TypeSwitchGuard = [ identifier ":=" ] Expression "." "(" "type" ")" .
TypeSwitchGuard = [ identifier ":=" ] PrimaryExpr "." "(" "type" ")" .
TypeCaseClause = TypeSwitchCase ":" { Statement ";" } .
TypeSwitchCase = "case" TypeList | "default" .
TypeList = Type { "," Type } .