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This CL changes cmd/compile to reject anonymous interface cycles like:
type I interface { m() interface { I } }
We don't anticipate any users to be affected by this change in
practice. Nonetheless, this CL also adds a `-d=interfacecycles`
compiler flag to suppress the error. And assuming no issue reports
from users, we'll move the check into go/types and types2 instead.
Updates #56103.
Change-Id: I1f1dce2d7aa19fb388312cc020e99cc354afddcb
Reviewed-on: https://go-review.googlesource.com/c/go/+/445598
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
45 lines
679 B
Go
45 lines
679 B
Go
// compile -d=interfacecycles
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// Copyright 2012 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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// Used to crash compiler in interface type equality check.
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// (This test used to have problems - see #15596.)
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package p
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// exported interfaces
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type I1 interface {
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F() interface{I1}
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}
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type I2 interface {
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F() interface{I2}
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}
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var V1 I1
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var V2 I2
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func F() bool {
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return V1 == V2
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}
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// non-exported interfaces
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type i1 interface {
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F() interface{i1}
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}
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type i2 interface {
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F() interface{i2}
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}
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var v1 i1
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var v2 i2
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func f() bool {
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return v1 == v2
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}
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