syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"trace!(\"{:#?}\","}]}
source_snippet:         trace!("{:#?}", predicates);
context_before:         let predicates = predicates.instantiate(self.tcx(), args);
context_after:         debug_assert_eq!(predicates.predicates.len(), origins.len());