[Bug middle-end/59711] ICE in force_constant_size, at gimplify.c:619 with variably-modified return type

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59711

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
      *R.4 = pr59711.f (); [return slot optimization]

ah, so we don't require a WITH_SIZE_EXPR on a RSO call.  Obviously.  So it
should be fixable either by the gimplifier or by the frontends (as Ada
does it).