[LLVMbugs] [Bug 19631] New: explicit specialization outside of template's namespace inaccuretly accepted

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19631

            Bug ID: 19631
           Summary: explicit specialization outside of template's
                    namespace inaccuretly accepted
           Product: clang
           Version: 3.4
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: filip.roseen at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12464
  --> http://llvm.org/bugs/attachment.cgi?id=12464&action=edit
testcase.cpp

namespace N {
  template<class>
  struct A { };
};

template<>
struct N::A<int> { };

int main () { }

-----------------------------------------------------------

According to `[temp.expl.spec]p2` the above snippet should be rejected, but
`clang` accepts it without any diagnostic (version >3.3).


  [temp.expl.spec]p2

  > An explicit specialization shall be declared in a namespace
  > enclosing the specialized template. An explicit
  > specialization whose declarator-id is not qualified shall be
  > declared in the nearest enclosing namespace of the template,
  > or, if the namespace is inline (7.3.1), any namespace from
  > its enclosing namespace set. Such a declaration may also be
  > a definition. If the declartion is not a definition, the
  > specialization may be defined later (7.3.1.2)

------------------------------------------------------------

[ note: I tried the snippet with version 3.3 of `clang`, and we get a warning
saying that the above is accepted due to `-Wc++11-extensions` (which is
misleading), in later versions of clang no such diagnostic is issued. ]

[ note: `gcc` rejects it, as one should ]

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