[LLVMbugs] [Bug 18574] New: clang++ accepts invalid using-directive

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18574

            Bug ID: 18574
           Summary: clang++ accepts invalid using-directive
           Product: clang
           Version: 3.3
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pipping at exherbo.org
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Please consider the following snippet of code:

<<SNIP

template <typename T> struct A {
  typedef int type;
};

template <typename T> struct B : public A<T> {
  //typedef typename A<T>::type type;
  //using type = typename A<T>::type;
  using typename A<T>::type;
  static const int block_size = type::block_size;
};

<<SNAP

Specifically, the line

  using typename A<T>::type;

Unlike the two lines just above it, this is not valid C++ from my understanding
(one of the other two lines is C++11, the other is pre-C++11).

g++ 4.7.2 rejects the line in question. clang 3.4 accepts it.

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