[LLVMbugs] [Bug 21803] New: wordsmith viable conversion error message for function return type

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21803

            Bug ID: 21803
           Summary: wordsmith viable conversion error message for function
                    return type
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nlewycky at google.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Testcase:

template<typename A, typename B = int> class X {};

X<float> f() {
  return X<float, double>();
}

$ clang b13910958.cc -fsyntax-only
b13910958.cc:4:10: error: no viable conversion from 'X<[...], double>' to
      'X<[...], (default) int>'
  return X<float, double>();
         ^~~~~~~~~~~~~~~~~~
b13910958.cc:1:46: note: candidate constructor (the implicit copy constructor)
      not viable: no known conversion from 'X<float, double>' to
      'const X<float, int> &' for 1st argument
template<typename A, typename B = int> class X {};
                                             ^
1 error generated.

Better would be "error: no viable conversion from returned value of type
'X<[...], double>' to function return type 'X<[...], (default) int>'"

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