http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49692

--- Comment #2 from John Kortink <kortink at inter dot nl.net> 2011-07-09 
23:08:02 UTC ---
(In reply to comment #1)
> Redundant parens are always possible.

They shouldn't always be possible. It is a laxity in the grammar that
needlessly causes context dependencies. And, in this case, rejection of a
perfectly valid language construct.

Even if the context dependency is not removed, the interpretation of 'classname
(variablename)' as a constructor call should be considered by the parser.

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