https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93043
Nik_Vzdornov <vzdornovna88 at yandex dot ru> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |vzdornovna88 at yandex dot ru --- Comment #2 from Nik_Vzdornov <vzdornovna88 at yandex dot ru> --- why is this considered a bug? Can I consider this as https://eel.is/c++draft/over.match.oper#11.sentence-1(CWG1687), which introduced: "except that the second standard conversion sequence of a user-defined conversion sequence (12.2.4.2.3 [over.ics.user]) is not applied". We even have cppref : "If the overload resolution selects a built-in candidate, the user-defined conversion sequence from an operand of class type is not allowed to have a second standard conversion sequence: the user-defined conversion function must give the expected operand type directly" and other cases when X { int operator(); } x; in the context of the expression x + 1.0 we consider https://eel.is/c++draft/over.built#10 firstly and then "Usual arithmetic conversions" ยง7.4 [expr.arith.conv].