[LLVMbugs] [Bug 24264] New: Name hiding in the same declarative region fails when done via using-directive

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24264

            Bug ID: 24264
           Summary: Name hiding in the same declarative region fails when
                    done via using-directive
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: anders.granlund.0 at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Consider the following well-formed program:

  namespace N { struct x {}; }
  using namespace N;
  int x;
  int main() { sizeof (x); }

Compile it with the following command line:

  clang++ prog.cc -std=c++98 -pedantic-errors

Observe that error messages about name lookup ambiguity are given. I expect to
get no errors when compiling since the program is well-formed.

That the program is well-formed can be seen by applying both [namespace.udir]/2
and [basic.scope.hiding]/2:

  http://eel.is/c++draft/dcl.dcl#namespace.udir-2
  http://eel.is/c++draft/basic.scope.hiding#2

This seems reasonable also, so I don't think this is a defect of the c++
standard.

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