big_lshift       1954 bignum.c       static VALUE big_lshift(VALUE, unsigned long);
big_lshift       1960 bignum.c       	return big_lshift(x, (unsigned int)-n);
big_lshift       2371 bignum.c           return big_lshift(x, shift);
big_lshift       2436 bignum.c           if (neg) return big_lshift(x, shift);