[cfe-commits] [Patch] - Avoid duplicated visits to default arguments for class templates

[Yang Chen]

Hi,

Seems RecursiveASTVisitor has a bug which could cause duplicated visits 
to default arguments for a class template. For example, given the code 
below:

class X;
template<class T = X> class Y;
template<class T> class Y {};

The default argument 'X' will be visited twice. The attached patch fixed 
the problem. I also attached a small testcase. Thanks.

- Yang
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