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// 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
type E interface { }
var e E
func main() {
e = t; // ok
t = e; // ERROR "need explicit|need type assertion"
// 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|need type assertion"
i = I(i2); // ok
i2 = I2(i); // ERROR "need explicit|need type assertion"
e = E(t); // ok
t = T(e); // ERROR "need explicit|need type assertion"
}
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