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Go patch commtited: Avoid crash with self-referential type

From: Ian Lance Taylor <iant at golang dot org>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>, "gofrontend-dev at googlegroups dot com" <gofrontend-dev at googlegroups dot com>
Date: Sun, 30 Nov 2014 17:29:52 -0800
Subject: Go patch commtited: Avoid crash with self-referential type
Authentication-results: sourceware.org; auth=none

This patch to the Go frontend, by Chris Manghane, avoids crashing on
code with self-referential types like

type T interface {
     m() [unsafe.Sizeof(T(nil).m())]int
}

This kind of code is perverse but of course the compiler should not
crash.  This is http://golang.org/issue/6637.   Bootstrapped and ran
testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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