syntax_data: {"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let discr = self.temp(discr_ty, test.span);
context_before:                 let discr_ty = adt_def.repr().discr_type().to_ty(self.tcx);
context_after:                 self.cfg.push_assign(