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https://github.com/golang/go
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a5d7c1f45e
// ERROR "pattern1" "pattern2" means that there has to be one or more lines matching pattern1 and then excluding those, there have to be one or more lines matching pattern2. So if you expect two different error messages from a particular line, writing two separate patterns checks that both errors are produced. Also, errchk now flags lines that produce more errors than expected. Before, as long as at least one error matched the pattern, all the others were ignored. Revise tests to expect or silence these additional errors. R=lvd, r, iant CC=golang-dev https://golang.org/cl/4869044
76 lines
1.3 KiB
Go
76 lines
1.3 KiB
Go
// errchk $G -e $D/$F.go
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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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// Static error messages about interface conversions.
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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 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|need type assertion"
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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" "as type [*]T"
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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 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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