syntax_data: {"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let eq_result = self.temp(bool_ty, source_info.span);
context_before:         let bool_ty = self.tcx.types.bool;
context_after:         let eq_block = self.cfg.start_new_block();