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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 "incompatible|missing M method"
t = i // ERROR "incompatible|need type assertion"
i = i2 // ok
i2 = i // ERROR "missing N method"
i = I(i2) // ok
i2 = I2(i) // ERROR "missing N method"
e = E(t) // ok
t = T(e) // ERROR "need explicit|need type assertion|incompatible"
}
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