https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83582
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Most likely because the requirement that two different lambdas need not to compare equal.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83582
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Most likely because the requirement that two different lambdas need not to compare equal.