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336ce966e4
For #55326 Change-Id: I3d0ff7f820f7b2009d1b226abf701b2337fe8cbc Reviewed-on: https://go-review.googlesource.com/c/go/+/432635 TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Robert Griesemer <gri@google.com> Run-TryBot: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com> Run-TryBot: xie cui <523516579@qq.com> Reviewed-by: Robert Griesemer <gri@google.com>
107 lines
2.0 KiB
Go
107 lines
2.0 KiB
Go
// errorcheck
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Verify compiler messages about erroneous static interface conversions.
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// Does not compile.
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package main
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type T struct {
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a int
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}
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var t *T
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type X int
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func (x *X) M() {}
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type I interface {
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M()
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}
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var i I
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type I2 interface {
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M()
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N()
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}
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var i2 I2
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type E interface{}
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var e E
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func main() {
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e = t // ok
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t = e // ERROR "need explicit|need type assertion"
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// neither of these can work,
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// because i has an extra method
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// that t does not, so i cannot contain a t.
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i = t // ERROR "incompatible|missing method M"
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t = i // ERROR "incompatible|assignment$"
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i = i2 // ok
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i2 = i // ERROR "incompatible|missing method N"
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i = I(i2) // ok
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i2 = I2(i) // ERROR "invalid|missing N method|cannot convert"
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e = E(t) // ok
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t = T(e) // ERROR "need explicit|need type assertion|incompatible|cannot convert"
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// cannot type-assert non-interfaces
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f := 2.0
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_ = f.(int) // ERROR "non-interface type|only valid for interface types|not an interface"
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}
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type M interface {
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M()
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}
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var m M
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var _ = m.(int) // ERROR "impossible type assertion"
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type Int int
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func (Int) M(float64) {}
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var _ = m.(Int) // ERROR "impossible type assertion"
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var _ = m.(X) // ERROR "pointer receiver"
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var ii int
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var jj Int
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var m1 M = ii // ERROR "incompatible|missing"
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var m2 M = jj // ERROR "incompatible|wrong type for method M"
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var m3 = M(ii) // ERROR "invalid|missing|cannot convert"
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var m4 = M(jj) // ERROR "invalid|wrong type for M method|cannot convert"
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type B1 interface {
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_() // ERROR "methods must have a unique non-blank name"
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}
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type B2 interface {
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M()
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_() // ERROR "methods must have a unique non-blank name"
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}
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type T2 struct{}
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func (t *T2) M() {}
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func (t *T2) _() {}
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// Already reported about the invalid blank interface method above;
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// no need to report about not implementing it.
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var b1 B1 = &T2{}
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var b2 B2 = &T2{}
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