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[Ada] New pragma Ada_2020

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Bob Duff <duff at adacore dot com>
Date: Fri, 8 Sep 2017 09:36:00 -0400
Subject: [Ada] New pragma Ada_2020
Authentication-results: sourceware.org; auth=none

This patch allows pragma Ada_2020 to be used to enable Ada 2020 features
that have been implemented in GNAT. Ada_2020 is a configuration
pragma. This is in addition to the -gnat2020 command-line switch.

Note: There is no synonym pragma Ada_20. We have Ada_05 and Ada_12, but
we decided long ago that for years after 2000, four-digit numbers look
better.

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

2017-09-08  Bob Duff  <duff@adacore.com>

	* par-prag.adb, sem_prag.adb, snames.ads-tmpl: Implement pragma
	Ada_2020, along the same lines as the other Ada version pragmas.

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