{"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
        let lvalue = bx.context.new_vector_access(None, variable.to_rvalue(), index);
        bx.llbb().add_assignment(None, variable, vector);
        // TODO(antoyo): if simd_insert is constant, use BIT_REF.