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go/test/interface/explicit.go
Russ Cox b9159722dd add test for yesterday's interface rule change (interface/convert1.go).
move interface tests to subdirectory.

R=r
DELTA=1632  (827 added, 804 deleted, 1 changed)
OCL=29181
CL=29191
2009-05-21 13:46:20 -07:00

35 lines
705 B
Go

// errchk $G $D/$F.go
// 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.
// Static error messages about interface conversions.
package main
type T struct { a int }
var t *T
type I interface { M() }
var i I
type I2 interface { M(); N(); }
var i2 I2;
var e interface { };
func main() {
e = t; // ok
t = e; // ERROR "need explicit"
// neither of these can work,
// because i has an extra method
// that t does not, so i cannot contain a t.
i = t; // ERROR "missing|incompatible|is not"
t = i; // ERROR "missing|incompatible|is not"
i = i2; // ok
i2 = i; // ERROR "need explicit"
}