syntax_data: {"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let storage = this.temp(Ty::new_mut_ptr(tcx, tcx.types.u8), expr_span);
context_before:                 );
context_after:                 let success = this.cfg.start_new_block();