[cfe-commits] [PATCH] Warn on duplicate const specifier

[Aaron Ballman]

This patch addresses PR13705 by turning the extension diagnostic into
its own warning group (-Wduplicate-decl-specifiers).  This helps
programmers catch const problems with code that likely doesn't behave
the way they expect it to.

This causes the following to warn, even though it's legal (depending
on what spec you're compiling against):

const char const *x;

~Aaron
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