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https://github.com/golang/go
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1912632019
bonus: type switch now detects multiple uses of identical interface types. bonus: interface types are now order-independent, following the spec. R=ken2 CC=golang-dev https://golang.org/cl/194053
70 lines
1.2 KiB
Go
70 lines
1.2 KiB
Go
package main
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import (
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p0 "./bug0"
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p1 "./bug1"
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)
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// both p0.T and p1.T are struct { X, Y int }.
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var v0 p0.T
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var v1 p1.T
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// interfaces involving the two
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type I0 interface {
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M(p0.T)
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}
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type I1 interface {
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M(p1.T)
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}
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// t0 satisfies I0 and p0.I
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type t0 int
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func (t0) M(p0.T) {}
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// t1 satisfies I1 and p1.I
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type t1 float
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func (t1) M(p1.T) {}
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// check static interface assignments
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var i0 I0 = t0(0) // ok
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var i1 I1 = t1(0) // ok
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var i2 I0 = t1(0) // ERROR "is not"
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var i3 I1 = t0(0) // ERROR "is not"
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var p0i p0.I = t0(0) // ok
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var p1i p1.I = t1(0) // ok
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var p0i1 p0.I = t1(0) // ERROR "is not"
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var p0i2 p1.I = t0(0) // ERROR "is not"
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func main() {
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// check that cannot assign one to the other,
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// but can convert.
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v0 = v1 // ERROR "assign"
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v1 = v0 // ERROR "assign"
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v0 = p0.T(v1)
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v1 = p1.T(v0)
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i0 = i1 // ERROR "need type assertion"
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i1 = i0 // ERROR "need type assertion"
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p0i = i1 // ERROR "need type assertion"
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p1i = i0 // ERROR "need type assertion"
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i0 = p1i // ERROR "need type assertion"
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i1 = p0i // ERROR "need type assertion"
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p0i = p1i // ERROR "need type assertion"
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p1i = p0i // ERROR "need type assertion"
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i0 = p0i
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p0i = i0
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i1 = p1i
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p1i = i1
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}
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