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go/test/fixedbugs/issue42568.go
David Chase 92c732e901 cmd/compile: fix load of interface{}-typed OpIData in expand_calls
In certain cases, the declkared type of an OpIData is interface{}.
This was not expected (since interface{} is a pair, right?) and
thus caused a crash.  What is intended is that these be treated as
a byteptr, so do that instead (this is what happens in 1.15).

Fixes #42568.

Change-Id: Id7c9e5dc2cbb5d7c71c6748832491ea62b0b339f
Reviewed-on: https://go-review.googlesource.com/c/go/+/270057
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2020-11-14 17:24:37 +00:00

26 lines
415 B
Go

// compile
// Copyright 2020 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.
// Ensure that late expansion correctly handles an OpIData with type interface{}
package p
type S struct{}
func (S) M() {}
type I interface {
M()
}
func f(i I) {
o := i.(interface{})
if _, ok := i.(*S); ok {
o = nil
}
println(o)
}