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[Ada] Compiler abort on nested instantions with pragma Ignore_Pragma.

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Ed Schonberg <schonberg at adacore dot com>
Date: Tue, 25 Apr 2017 09:05:19 -0400
Subject: [Ada] Compiler abort on nested instantions with pragma Ignore_Pragma.
Authentication-results: sourceware.org; auth=none

This patch fixes a crash in a compilation involving nested generics when
a generic subprogram carries an Inline_Always pragma, and a configuration
file has a corresponding pragma Ignore_Pragma (Inline_Always).

No small example available.

Tested on x86_64-pc-linux-gnu, committed on trunk

2017-04-25  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch12.adb (Load_Parent_Of_Generic); When retrieving the
	declaration of a subprogram instance within its wrapper package,
	skip over null statements that may result from the rewriting of
	ignored pragmas.

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