fn cs_clone(
cx: &ExtCtxt<'_>,
trait_span: Span,
substr: Substructure<'_>,
type_ident: Ident,
) -> BlockOrExprfn cs_clone(
cx: &ExtCtxt<'_>,
trait_span: Span,
substr: Substructure<'_>,
type_ident: Ident,
) -> BlockOrExpr