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[Ada] Better error message for a ** b ** c

This patch gives better error recovery and message for a ** b ** c

    1. package ParenExp is
    2.    a : Integer := 2 ** 3 ** 4;
                                |
       >>> parenthesization required for **

    3. end;

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

2012-03-19  Robert Dewar  <dewar@adacore.com>

	* par-ch4.adb (Check_Bad_Exp): New procedure

Attachment: difs
Description: Text document

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