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Date: Mon, 20 Feb 2017 12:52:41 -0800 (PST)
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Subject: relax double parens in expression_function_declaration?
From: Stephen Leake <stephen_leake@stephe-leake.org>
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Xref: news.eternal-september.org comp.lang.ada:33367
Date: 2017-02-20T12:52:41-08:00
List-Id: <comp.lang.ada>

Recent GNAT allows this:

   type Result is record
      A : Integer;
      B : Integer;
   end record;

   function Key return Result is
     (A => 1,
      B => 2);

However, I can't find a rule in the ARM that allows it.
ARM 6.8 says:

   expression_function_declaration ::=
        [overriding_indicator]
        function_specification is
            (expression)
            [aspect_specification];

This requires double parens:

   function Key return Result is
     ((A => 1,
       B => 2));

ARM 4.5.7(7) gives permission to remove the double parens for conditional_expression; is there a similar rule or AI for aggregates?