https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111923
--- Comment #9 from Richard Smith <richard-gccbugzilla at metafoo dot co.uk> --- I don't think we intended for default arguments of class-scope lambdas to get the same complete-class context treatment as default argument of member functions, but the standard wording does currently seem to suggest that they do get that treatment. Filed https://github.com/cplusplus/CWG/issues/449 to suggest the standard wording be fixed to match the implementations.
