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1737aef270
This change adds line position tests for several yyerror calls in the typechecker that are currently not tested in any way. Untested yyerror calls were found by replacing them with yerrorl(src.NoXPos, ...) (thus destroying position information in the error), and then running the test suite. No failures means no test coverage for the relevant yyerror call. For #19683 Change-Id: Iedb3d2f02141b332e9bfa76dbf5ae930ad2fddc3 Reviewed-on: https://go-review.googlesource.com/41477 Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com> Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
106 lines
1.9 KiB
Go
106 lines
1.9 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 M method"
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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 N method"
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i = I(i2) // ok
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i2 = I2(i) // ERROR "invalid|missing N method"
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e = E(t) // ok
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t = T(e) // ERROR "need explicit|need type assertion|incompatible"
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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"
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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 M method"
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var m3 = M(ii) // ERROR "invalid|missing"
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var m4 = M(jj) // ERROR "invalid|wrong type for M method"
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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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// Check that nothing satisfies an interface with blank methods.
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var b1 B1 = &T2{} // ERROR "incompatible|missing _ method"
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var b2 B2 = &T2{} // ERROR "incompatible|missing _ method"
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