https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68114
Daniel Krügler <daniel.kruegler at googlemail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |daniel.kruegler@googlemail. | |com --- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> --- I disagree. According to [dcl.fct] p11 of the current working draft: "The type of a parameter or the return type for a function definition shall not be an incomplete (possibly cv-qualified) class type in the context of the function definition unless the function is deleted (8.4.3)." This wording came in via http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1394 Clang does not accept the code example, but that looks like a clang defect to me.