[LLVMbugs] [Bug 11758] New: declarations made visible by using-directive are hidden by namespace members during unqualified name lookup

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11758

             Bug #: 11758
           Summary: declarations made visible by using-directive are
                    hidden by namespace members during unqualified name
                    lookup
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: zilla at kayari.org
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


namespace N
{
  void f();
  void g();
  void h();

  namespace { void f(int) { } }

  namespace unique { }
  using namespace unique;
  namespace unique { void g(int) { } }

}

void N::h() {
  f(1);
  g(1);
}


c.cc:16:3: error: no matching function for call to 'f'
  f(1);
  ^
c.cc:3:8: note: candidate function not viable: requires 0 arguments, but 1 was
provided
  void f();
       ^
c.cc:17:3: error: no matching function for call to 'g'
  g(1);
  ^
c.cc:4:8: note: candidate function not viable: requires 0 arguments, but 1 was
provided
  void g();
       ^
2 errors generated.


The using-directive should mean unique::g is considered a member of N for the
purposes of unqualified name lookup, [basic.lookup.unqual]/2.
The unnamed namespace should behave the same, [namespace.unnamed]/1.

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