syntax_data: {"ast_node_type":"other","tokens":[{"end":1,"kind":"keyword","start":0,"text":"{"}]}
source_snippet: {
context_before:     R: PredicateEmittingRelation<Infcx>,
context_after:     debug!("super_combine_consts::<{}>({:?}, {:?})", std::any::type_name::<R>(), a, b);