syntax_data: {"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"#[diag(ty_utils_impl_trait_duplicate_arg)]"}]}
source_snippet: #[diag(ty_utils_impl_trait_duplicate_arg)]
context_before: #[derive(Diagnostic)]
context_after: pub(crate) struct DuplicateArg<'tcx> {