syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"fn_traits:"}]}
source_snippet:         fn_traits: &mut FxIndexMap<
context_before:         >,
context_after:             (ty::Binder<'tcx, (&'tcx ty::List<Ty<'tcx>>, Ty<'tcx>)>, bool),