syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"impl<'o,"}]}
source_snippet: impl<'o, 'tcx> fmt::Debug for TraitObligationStack<'o, 'tcx> {
context_after:     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {