http://llvm.org/bugs/show_bug.cgi?id=16755

            Bug ID: 16755
           Summary: constexpr evaluation doesn't correctly truncate
                    bitfield values
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected]
    Classification: Unclassified

Testcase:

struct X {
  int x : 1;
  constexpr static int f(int x) {
    return X{x}.x;
  }
};
static_assert(X::f(3) == -1, "3 should truncate to -1");

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