syntax_data: {"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let slice_ptr = self.temp(ptr_ty, span);
context_before:                     let ptr_ty = Ty::new_imm_ptr(self.tcx, place_ty);
context_after:                     self.cfg.push_assign(