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go/test/fixedbugs/issue44266.go
Robert Griesemer e22af33b48 go/types, types2: more concise error messages for cycle errors
If a cycle has length 1, don't enumerate the single cycle entry;
instead just mention "refers to itself". For instance, for an
invalid recursive type T we now report:

	invalid recursive type: T refers to itself

instead of:

	invalid recursive type T
		T refers to
		T

Adjust tests to check for the different error messages.

Change-Id: I5bd46f62fac0cf167f0d0c9a55f952981d294ff4
Reviewed-on: https://go-review.googlesource.com/c/go/+/436295
Run-TryBot: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Robert Griesemer <gri@google.com>
2022-09-29 14:21:33 +00:00

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Go

// errorcheck
// Copyright 2021 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.
package p
import "io"
type T1 interface {
io.Reader
}
type T2 struct {
io.SectionReader
}
type T3 struct { // ERROR "invalid recursive type: T3 refers to itself"
T1
T2
parent T3
}