syntax_data: {"ast_node_type":"function","tokens":[{"end":95,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn new_lang_item(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, item: LangItem) -> Option<Ty<'tcx>> {
context_before:     #[inline]
context_after:         let def_id = tcx.lang_items().get(item)?;