{"ast_node_type":"variable","tokens":[{"end":82,"kind":"keyword","start":0,"text":"let"}]}
        let (out_len, element_ty1) = require_simd!(args[1].layout.ty, SimdSecond);
        let (_, element_ty0) = require_simd!(in_ty, SimdFirst);
        // The element type of the third argument must be a signed integer type of any width: