rb_proc_arity     550 hash.c         	int n = rb_proc_arity(proc);
rb_proc_arity     430 include/ruby/intern.h int rb_proc_arity(VALUE);
rb_proc_arity     901 proc.c             int arity = rb_proc_arity(self);
rb_proc_arity    1080 proc.c         	return unnamed_parameters(rb_proc_arity(self));