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gc: fix return variable named _

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Fixes #1712.

R=ken2
CC=golang-dev
https://golang.org/cl/4445055
This commit is contained in:
Russ Cox 2011-04-23 10:54:19 -04:00
parent 7879d3118c
commit 815a1b84c7
2 changed files with 43 additions and 0 deletions
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7
src/cmd/gc/dcl.c
View File

@ -560,6 +560,7 @@ funcargs(Node *nt)
{
Node *n;
NodeList *l;
int gen;
if(nt->op != OTFUNC)
fatal("funcargs %O", nt->op);
@ -589,6 +590,7 @@ funcargs(Node *nt)
}
// declare the out arguments.
gen = 0;
for(l=nt->rlist; l; l=l->next) {
n = l->n;
if(n->op != ODCLFIELD)
@ -596,6 +598,11 @@ funcargs(Node *nt)
if(n->left != N) {
n->left->op = ONAME;
n->left->ntype = n->right;
if(isblank(n->left)) {
// Give it a name so we can assign to it during return.
snprint(namebuf, sizeof(namebuf), ".anon%d", gen++);
n->left->sym = lookup(namebuf);
}
declare(n->left, PPARAMOUT);
}
}

36
test/fixedbugs/bug331.go Normal file
View File

@ -0,0 +1,36 @@
// $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: bug331
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import "os"
func f() (_ string, x float64, err os.Error) {
return
}
func g() (_ string, x float64, err os.Error) {
return "hello", 3.14, os.EOF
}
var _ func() (string, float64, os.Error) = f
var _ func() (string, float64, os.Error) = g
func main() {
x, y, z := g()
if x != "hello" || y != 3.14 || z != os.EOF {
println("wrong", x, len(x), y, z)
}
}
/*
issue 1712
bug331.go:12: cannot use "hello" (type string) as type float64 in assignment
bug331.go:12: cannot use 0 (type float64) as type os.Error in assignment:
float64 does not implement os.Error (missing String method)
bug331.go:12: error in shape across RETURN
*/