{"ast_node_type":"variable","tokens":[{"end":40,"kind":"keyword","start":0,"text":"let"}]}
    let v = match src_layout.ty.kind() {
    let from_scalar = ScalarInt::try_from_uint(src_val.into(), src_layout.size).unwrap();
        ty::Uint(_) => from_scalar.to_uint(src_layout.size),