syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"obj:"}]}
source_snippet:         obj: &'tcx List<ty::PolyExistentialPredicate<'tcx>>,
context_before:         tcx: TyCtxt<'tcx>,
context_after:         reg: ty::Region<'tcx>,