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[Ada] Syntactic error recovery for case expressions

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: Tue, 25 Apr 2017 04:04:51 -0400
Subject: [Ada] Syntactic error recovery for case expressions
Authentication-results: sourceware.org; auth=none

This patch improves the synactic error recovery in the case where a ";"
is used instead of "," in a case expression. The following test should
get these errors:

case_exp_semi.ads:5:28: ";" should be ","

package Case_Exp_Semi is

   X : Integer := 1;
   Y : Integer :=
     (case X is when 1 => 1; when 2 => 2, when others => 3);

end Case_Exp_Semi;

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

2017-04-25  Bob Duff  <duff@adacore.com>

	* par-ch4.adb (P_Case_Expression): If a semicolon
	is followed by "when", assume that ";" was meant to be ",".

Attachment: difs
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