[LLVMbugs] [Bug 16906] New: an explicit specialization of a member template of a class template specialization should not inherit partial specializations from the class template specialization

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16906

            Bug ID: 16906
           Summary: an explicit specialization of a member template of a
                    class template specialization should not inherit
                    partial specializations from the class template
                    specialization
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Clang rejects this valid code:

template<typename T> struct A {
  template<typename U> struct B {};
  template<typename U> struct B<U*> {};
};
template<> template<typename U> struct A<int>::B { typedef int type; };
A<int>::B<int*>::type x;

Here, per [temp.class.spec.mfunc](14.5.5.3)p2, A<int>::B<int*> uses the
explicit specialization of A<int>::B, not the partial specialization from A<T>,
so this code should be valid. But clang picks the partial specialization from
inside A<T> and rejects it.

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