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cmd/gc: Make sure bools lose idealness when used with logical operators.

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Bools from comparisons can be assigned to all bool types, but this idealness would propagate through logical operators when the result should have been lowered to a non-ideal form.

Fixes #3924.

R=golang-dev, remyoudompheng, r, rsc, mtj
CC=golang-dev
https://golang.org/cl/6855061
This commit is contained in:
Daniel Morsing 2012-11-26 22:23:13 +01:00
parent 9a61c0412c
commit 5188c0b59c
2 changed files with 17 additions and 1 deletions
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5
src/cmd/gc/typecheck.c
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@ -614,7 +614,10 @@ reswitch:
n->left = l;
n->right = r;
}
}
// non-comparison operators on ideal bools should make them lose their ideal-ness
} else if(t == idealbool)
t = types[TBOOL];
if(et == TSTRING) {
if(iscmp[n->op]) {
n->etype = n->op;

13
test/fixedbugs/issue3924.go Normal file
View File

@ -0,0 +1,13 @@
// errorcheck
// Copyright 2012 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 foo
type mybool bool
var x, y = 1, 2
var _ mybool = x < y && x < y // ERROR "cannot use"
var _ mybool = x < y || x < y // ERROR "cannot use"