[LLVMbugs] [Bug 11856] New: Bad diagnostic when member reference collides with global template function

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11856

             Bug #: 11856
           Summary: Bad diagnostic when member reference collides with
                    global template function
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: jyasskin at google.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


In the following program, Foo() is trying to use a public member variable of
"*it1". Because there's a global template with the same name, it interprets the
subsequent '<' as starting a template instantiation, and then finds trouble
many tokens later when there's no matching '>'.

$ cat test.ii
template<typename T> T end(T);

template <typename T>
void Foo() {
  T it1;
  if (it1->end < it1->end) {
  }
}
$ clang -fsyntax-only test.ii
test.ii:6:26: error: expected '>'
  if (it1->end < it1->end)
                         ^
test.ii:6:26: error: expected unqualified-id
2 errors generated.
$


The error should at least mention the template it was trying to find a
parameter for.

A possible fixit is to add parentheses around "it1->end". 

This will come up more often in C++11, where there's a std::end<>() that lots
of people will 'using' into their global namespaces.

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