suspicious_foreign_code.m:015: Warning: the body of this
suspicious_foreign_code.m:015:   `:- pragma foreign_code' declaration may refer
suspicious_foreign_code.m:015:   to the `MR_ALLOC_ID' macro. That macro is only
suspicious_foreign_code.m:015:   defined within the body of
suspicious_foreign_code.m:015:   `:- pragma foreign_proc' declarations.