{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
                    let rhs = fx.bcx.ins().uextend(ty.double_width().unwrap(), rhs);
                    let lhs = fx.bcx.ins().uextend(ty.double_width().unwrap(), lhs);
                    let val = fx.bcx.ins().imul(lhs, rhs);