go source for verification 2026-05-22

test/fixedbugs/bug248.dir/bug2.go

@@ -0,0 +1,73 @@
+// 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 s
+
+import (
+	p0 "./bug0"
+	p1 "./bug1"
+)
+
+// both p0.T and p1.T are struct { X, Y int }.
+
+var v0 p0.T
+var v1 p1.T
+
+// interfaces involving the two
+
+type I0 interface {
+	M(p0.T)
+}
+
+type I1 interface {
+	M(p1.T)
+}
+
+// t0 satisfies I0 and p0.I
+type t0 int
+
+func (t0) M(p0.T) {}
+
+// t1 satisfies I1 and p1.I
+type t1 float64
+
+func (t1) M(p1.T) {}
+
+// check static interface assignments
+var i0 I0 = t0(0) // ok
+var i1 I1 = t1(0) // ok
+
+var i2 I0 = t1(0) // ERROR "does not implement|incompatible"
+var i3 I1 = t0(0) // ERROR "does not implement|incompatible"
+
+var p0i p0.I = t0(0) // ok
+var p1i p1.I = t1(0) // ok
+
+var p0i1 p0.I = t1(0) // ERROR "does not implement|incompatible"
+var p0i2 p1.I = t0(0) // ERROR "does not implement|incompatible"
+
+func foobar() {
+	// check that cannot assign one to the other,
+	// but can convert.
+	v0 = v1 // ERROR "assign|cannot use"
+	v1 = v0 // ERROR "assign|cannot use"
+
+	v0 = p0.T(v1)
+	v1 = p1.T(v0)
+
+	i0 = i1   // ERROR "cannot use|incompatible"
+	i1 = i0   // ERROR "cannot use|incompatible"
+	p0i = i1  // ERROR "cannot use|incompatible"
+	p1i = i0  // ERROR "cannot use|incompatible"
+	i0 = p1i  // ERROR "cannot use|incompatible"
+	i1 = p0i  // ERROR "cannot use|incompatible"
+	p0i = p1i // ERROR "cannot use|incompatible"
+	p1i = p0i // ERROR "cannot use|incompatible"
+
+	i0 = p0i
+	p0i = i0
+
+	i1 = p1i
+	p1i = i1
+}