https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64251
--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- For example: markus@x4 /tmp % cat foo.ii class DictionaryValue {}; template <typename T> void CreateValue(T) { DictionaryValue(0); CreateValue(0); } markus@x4 /tmp % checking-release/g++ -std=c++11 -c foo.ii markus@x4 /tmp % checking-yes/g++ -std=c++11 -c foo.ii foo.ii: In instantiation of ‘void CreateValue(T) [with T = int]’: foo.ii:4:17: required from here foo.ii:3:4: error: no matching function for call to ‘DictionaryValue::DictionaryValue(int)’ DictionaryValue(0); ^ foo.ii:1:7: note: candidate: constexpr DictionaryValue::DictionaryValue() class DictionaryValue {}; ^ foo.ii:1:7: note: candidate expects 0 arguments, 1 provided foo.ii:1:7: note: candidate: constexpr DictionaryValue::DictionaryValue(const DictionaryValue&) foo.ii:1:7: note: no known conversion for argument 1 from ‘int’ to ‘const DictionaryValue&’ foo.ii:1:7: note: candidate: constexpr DictionaryValue::DictionaryValue(DictionaryValue&&) foo.ii:1:7: note: no known conversion for argument 1 from ‘int’ to ‘DictionaryValue&&’