{"ast_node_type":"variable","tokens":[{"end":74,"kind":"keyword","start":0,"text":"let"}]}
        let index = bx.context.new_rvalue_from_int(bx.int_type, i as i32);
    for i in 0..num_units {
        let a_val = bx.context.new_vector_access(None, a, index).to_rvalue();