[LLVMbugs] [Bug 7681] New: confusing error with incomplete type

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7681

           Summary: confusing error with incomplete type
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: clattner at apple.com
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


Missing a #include caused clang to generate a super confusing error:

$ cat t.cc 

  template <typename PT1, typename PT2>
  class PointerUnion;

void foo(PointerUnion<int*, float*> &Result) {
  int *P = 0;
  Result = P;
}
$ clang t.cc 
t.cc:7:10: error: no viable overloaded '='
  Result = P;
  ~~~~~~ ^ ~
1 error generated.


It should tell me that result is incomplete.

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