syntax_data: {"ast_node_type":"function","tokens":[{"end":89,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet: fn impl_self_is_guaranteed_unsized<'tcx>(tcx: TyCtxt<'tcx>, impl_def_id: DefId) -> bool {
context_after:     debug_assert_eq!(tcx.def_kind(impl_def_id), DefKind::Impl { of_trait: true });