{"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"let"}]}
    let loc_layout = ecx.layout_of(loc_ty).unwrap();
        .instantiate(*ecx.tcx, ecx.tcx.mk_args(&[ecx.tcx.lifetimes.re_erased.into()]));
    let location = ecx.allocate(loc_layout, MemoryKind::CallerLocation).unwrap();