https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70295
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Unfortunately that patch regresses the c-c++-common/nonnull-1.c testcase. The problem is that finish_parenthesized_expr which sets TREE_NO_WARNING on all expressions. Will see if setting it solely on MODIFY_EXPRs isn't enough.
