test: silence/coalesce some tests
Add copyright notice to nilptr.go.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5139048
diff --git a/test/cmp.go b/test/cmp.go
new file mode 100644
index 0000000..570487d
--- /dev/null
+++ b/test/cmp.go
@@ -0,0 +1,170 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2009 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 "unsafe"
+
+func use(bool) {}
+
+func stringptr(s string) uintptr { return *(*uintptr)(unsafe.Pointer(&s)) }
+
+func isfalse(b bool) {
+ if b {
+ // stack will explain where
+ panic("wanted false, got true")
+ }
+}
+
+func istrue(b bool) {
+ if !b {
+ // stack will explain where
+ panic("wanted true, got false")
+ }
+}
+
+type T *int
+
+func main() {
+ var a []int
+ var b map[string]int
+
+ var c string = "hello"
+ var d string = "hel" // try to get different pointer
+ d = d + "lo"
+ if stringptr(c) == stringptr(d) {
+ panic("compiler too smart -- got same string")
+ }
+
+ var e = make(chan int)
+
+ var ia interface{} = a
+ var ib interface{} = b
+ var ic interface{} = c
+ var id interface{} = d
+ var ie interface{} = e
+
+ // these comparisons are okay because
+ // string compare is okay and the others
+ // are comparisons where the types differ.
+ isfalse(ia == ib)
+ isfalse(ia == ic)
+ isfalse(ia == id)
+ isfalse(ib == ic)
+ isfalse(ib == id)
+ istrue(ic == id)
+ istrue(ie == ie)
+
+ // these are okay because one side of the
+ // comparison need only be assignable to the other.
+ isfalse(a == ib)
+ isfalse(a == ic)
+ isfalse(a == id)
+ isfalse(b == ic)
+ isfalse(b == id)
+ istrue(c == id)
+ istrue(e == ie)
+
+ isfalse(ia == b)
+ isfalse(ia == c)
+ isfalse(ia == d)
+ isfalse(ib == c)
+ isfalse(ib == d)
+ istrue(ic == d)
+ istrue(ie == e)
+
+ // 6g used to let this go through as true.
+ var g uint64 = 123
+ var h int64 = 123
+ var ig interface{} = g
+ var ih interface{} = h
+ isfalse(ig == ih)
+
+ // map of interface should use == on interface values,
+ // not memory.
+ // TODO: should m[c], m[d] be valid here?
+ var m = make(map[interface{}]int)
+ m[ic] = 1
+ m[id] = 2
+ if m[ic] != 2 {
+ println("m[ic] = ", m[ic])
+ panic("bad m[ic]")
+ }
+
+ // non-interface comparisons
+ {
+ c := make(chan int)
+ c1 := (<-chan int)(c)
+ c2 := (chan<- int)(c)
+ istrue(c == c1)
+ istrue(c == c2)
+ istrue(c1 == c)
+ istrue(c2 == c)
+
+ d := make(chan int)
+ isfalse(c == d)
+ isfalse(d == c)
+ isfalse(d == c1)
+ isfalse(d == c2)
+ isfalse(c1 == d)
+ isfalse(c2 == d)
+ }
+
+ // named types vs not
+ {
+ var x = new(int)
+ var y T
+ var z T = x
+
+ isfalse(x == y)
+ istrue(x == z)
+ isfalse(y == z)
+
+ isfalse(y == x)
+ istrue(z == x)
+ isfalse(z == y)
+ }
+
+ shouldPanic(p1)
+ shouldPanic(p2)
+ shouldPanic(p3)
+ shouldPanic(p4)
+}
+
+func p1() {
+ var a []int
+ var ia interface{} = a
+ use(ia == ia)
+}
+
+func p2() {
+ var b []int
+ var ib interface{} = b
+ use(ib == ib)
+}
+
+func p3() {
+ var a []int
+ var ia interface{} = a
+ var m = make(map[interface{}] int)
+ m[ia] = 1
+}
+
+func p4() {
+ var b []int
+ var ib interface{} = b
+ var m = make(map[interface{}] int)
+ m[ib] = 1
+}
+
+func shouldPanic(f func()) {
+ defer func() {
+ if recover() == nil {
+ panic("function should panic")
+ }
+ }()
+ f()
+}
