Bug 19805 – wrong windows mangling for generic arguments with two identical template args

C++ ================================== template<class T, class T> struct C {}; template<class T> struct R {}; void bar3(C<int*, int*>) {} void bar4(C<R<int>, R<int>>) {} // ?bar3@@YAXU?$C@PEAHPEAH@@@Z // ?bar4@@YAXU?$C@U?$R@H@@U1@@@@Z ================================== D ================================== struct C(T1, T2) {} struct R(T) {} extern(C++): void bar3(C!(int*, int*)); void bar4(C!(R!int, R!int)); pragma(msg, bar3.mangleof); pragma(msg, bar4.mangleof); // ?bar3@@YAXU?$C@PEAH0@@@Z (wrong) // ?bar4@@YAXU?$C@U?$R@H@@0@@@Z (wrong) ==================================

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