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Go patch committed: avoid orphaning Bexpressions when processing conversions

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: Mon, 12 Jun 2017 10:52:13 -0700
Subject: Go patch committed: avoid orphaning Bexpressions when processing conversions
Authentication-results: sourceware.org; auth=none

The Go frontend method Type_conversion_expression::do_get_backend was
(in some circumstances) creating a Bexpression for the source
expression of the conversion and then throwing it away before using
it.  This patch by Than McIntosh fixes up this method to insure that
the call to get_backend() on the source expression is only made when
the result will be used.  Bootstrapped and ran Go testsuite on
x86_64-pc-linux-gnu.  Committed to mainline.

Ian

Attachment: patch.txt
Description: Text document

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