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go/test/fixedbugs/bug195.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 -lang=go1.17
// Copyright 2009 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 main
type I1 interface{ I2 } // ERROR "interface"
type I2 int
type I3 interface{ int } // ERROR "interface"
type S struct { // GC_ERROR "invalid recursive type"
x interface{ S } // GCCGO_ERROR "interface"
}
type I4 interface { // GC_ERROR "invalid recursive type: I4 refers to itself"
I4 // GCCGO_ERROR "interface"
}
type I5 interface { // GC_ERROR "invalid recursive type I5\n\tLINE:.* I5 refers to\n\tLINE+4:.* I6 refers to\n\tLINE:.* I5$"
I6
}
type I6 interface {
I5 // GCCGO_ERROR "interface"
}