[cfe-dev] recordDecl() matching weirdness

[Richard via cfe-dev]

For reference, please see:
<https://llvm.org/bugs/show_bug.cgi?id=26613>
    recordDecl(unless(isDefinition())) is not the inverse of
    recordDecl(isDefinition())

<https://llvm.org/bugs/show_bug.cgi?id=26614>
    recordDecl() matches same declaration twice

I'm working in trunk, but I checked against release_36 branch and saw
the same results.

Given this source:

 1	class Foo;
 2	class Foo;
 3	
 4	class Bar {
 5	};
 6	
 7	class Bar;

Why does line 4 match recordDecl() twice?

If I try to filter declarations from definitions using
TagDecl::isThisDeclarationADefinition(), then one of the matches is
rejected, but the fact that it matches twice means that:

recordDecl(isDefinition()) matches line 4, but none of the others.
recordDecl(unless(isDefinition())) matches line 4 as well as the others.

What is going on here?
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