syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"assert!(!obligation.has_escaping_bound_vars());"}]}
source_snippet:             assert!(!obligation.has_escaping_bound_vars());
context_before:         for mut obligation in self.out {
context_after:             let mut selcx = traits::SelectionContext::new(infcx);