pub(crate) fn expand_derive_macro_cached(
invoc_id: LocalExpnId,
input: TokenStream,
ecx: &mut ExtCtxt<'_>,
client: Client,
) -> Result<TokenStream, ()>pub(crate) fn expand_derive_macro_cached(
invoc_id: LocalExpnId,
input: TokenStream,
ecx: &mut ExtCtxt<'_>,
client: Client,
) -> Result<TokenStream, ()>