{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"//"}]}
        // Let's make sure v is sign-extended *if* it has a signed type.
    ) -> InterpResult<'tcx, Scalar<M::Provenance>> {
        let signed = src_layout.backend_repr.is_signed(); // Also asserts that abi is `Scalar`.