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Diffstat (limited to 'test/cmp6.go')
-rw-r--r-- | test/cmp6.go | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/test/cmp6.go b/test/cmp6.go new file mode 100644 index 000000000..981a85953 --- /dev/null +++ b/test/cmp6.go @@ -0,0 +1,42 @@ +// errchk $G -e $D/$F.go + +// Copyright 2010 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 + +func use(bool) {} + +type T1 *int +type T2 *int + +func main() { + // Arguments to comparison must be + // assignable one to the other (or vice versa) + // so chan int can be compared against + // directional channels but channel of different + // direction cannot be compared against each other. + var c1 chan <-int + var c2 <-chan int + var c3 chan int + + use(c1 == c2) // ERROR "invalid operation" + use(c2 == c1) // ERROR "invalid operation" + use(c1 == c3) + use(c2 == c2) + use(c3 == c1) + use(c3 == c2) + + // Same applies to named types. + var p1 T1 + var p2 T2 + var p3 *int + + use(p1 == p2) // ERROR "invalid operation" + use(p2 == p1) // ERROR "invalid operation" + use(p1 == p3) + use(p2 == p2) + use(p3 == p1) + use(p3 == p2) +} |