[llvm-bugs] [Bug 35042] New: clang disagrees with {gcc, icc, msvc} about ambiguous name

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35042

            Bug ID: 35042
           Summary: clang disagrees with {gcc,icc,msvc} about ambiguous
                    name
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: chisophugis at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

GCC and clang seem to disagree about whether the reference to `isa` in this
snippet is valid:

namespace myarch {
  namespace isa {
  }
}

using namespace myarch;

namespace llvm {
  template <typename T>
  void isa() {}
}

using namespace llvm;

void f() {
  isa<int>();
}


Clang accepts this code. GCC says `error: reference to 'isa' is ambiguous`.

https://godbolt.org/g/ix2jsS

Also, ICC and MSVC seem to believe that it is ambiguous as well.

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