static O pcallFInRealMC(fO realm, fO f, fO... args) {
  pcall { ret callFInRealMC(realm, f, args); }
  null;
}

ifclass F0
static <A> A pcallFInRealMC(O realm, F0<A> f) null on exception {
  ret f == null ? null : f.get();
}
endif

ifclass F1
static <A, B> B pcallFInRealMC(O realm, F1<A, B> f, A a) null on exception {
  ret f == null ? null : f.get(a);
}
endif

Began life as a copy of #1005301