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840b346c5d
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>
47 lines
1.5 KiB
Go
47 lines
1.5 KiB
Go
// errorcheck
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// Copyright 2022 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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package p
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// Self recursion.
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type i interface{ m() interface{ i } } // ERROR "invalid recursive type"
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type _ interface{ i } // no redundant error
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// Mutual recursion.
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type j interface{ m() interface{ k } } // ERROR "invalid recursive type"
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type k interface{ m() interface{ j } }
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// Both self and mutual recursion.
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type (
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a interface { // ERROR "invalid recursive type"
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m() interface {
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a
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b
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}
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}
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b interface {
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m() interface {
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a
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b
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}
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}
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)
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// Self recursion through other types.
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func _() { type i interface{ m() *interface{ i } } } // ERROR "invalid recursive type"
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func _() { type i interface{ m() []interface{ i } } } // ERROR "invalid recursive type"
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func _() { type i interface{ m() [0]interface{ i } } } // ERROR "invalid recursive type"
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func _() { type i interface{ m() chan interface{ i } } } // ERROR "invalid recursive type"
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func _() { type i interface{ m() map[interface{ i }]int } } // ERROR "invalid recursive type"
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func _() { type i interface{ m() map[int]interface{ i } } } // ERROR "invalid recursive type"
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func _() { type i interface{ m() func(interface{ i }) } } // ERROR "invalid recursive type"
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func _() { type i interface{ m() func() interface{ i } } } // ERROR "invalid recursive type"
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func _() {
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type i interface { // ERROR "invalid recursive type"
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m() struct{ i interface{ i } }
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}
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}
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