commit | 5650a53dac73703a1bc095a277a194813519001f | [log] [tgz] |
---|---|---|
author | Robert Griesemer <gri@golang.org> | Tue Oct 08 15:45:14 2019 -0700 |
committer | Robert Griesemer <gri@golang.org> | Tue Oct 08 23:32:42 2019 +0000 |
tree | e3bdfd7078397dfce5e0d56aa1c55247033efc18 | |
parent | ce83f41fed32bfc7826ec0cd7756a34594f8746b [diff] |
go/types: don't skip defined types when reporting cycles The newly introduced "late-stage" cycle detection for types (https://golang.org/cl/196338/) "skips" named types on the RHS of a type declaration when reporting a cycle. For instance, for: type ( A B B [10]C C A ) the reported cycle is: illegal cycle in declaration of C C refers to C because the underlying type of C resolves to [10]C (note that cmd/compile does the same but simply says invalid recursive type C). This CL introduces the Named.orig field which always refers to the RHS type in a type definition (and is never changed). By using Named.orig rather than Named.underlying for the type validity check, the cycle as written in the source code is reported: illegal cycle in declaration of A A refers to B refers to C refers to A Fixes #34771. Change-Id: I41e260ceb3f9a15da87ffae6a3921bd8280e2ac4 Reviewed-on: https://go-review.googlesource.com/c/go/+/199937 Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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