ERROR: generate-metadata

Hi, I'm coding and testing smartcontracts. I want to test a smartcontract using U256. lib.rs file is:

#![feature(proc_macro_hygiene)]
#![cfg_attr(not(feature = "std"), no_std)]

use ink_core::storage;
use ink_lang2 as ink;
use primitive_types::U256;

#[ink::contract(version = "0.1.0")]
mod big_number {
    #[ink(storage)]
    struct BigNumber {
        // Storage Declaration
    }

    impl BigNumber {
        #[ink(constructor)]
        fn new(&mut self, init_value: i32) {
            // Contract Constructor
        }

        #[ink(message)]
        fn get(&self) {
            // Contract Message
        }

        #[ink(message)]
        fn insert_number(&self, number: U256) {

        }
    }

    #[cfg(test)]
    mod tests {
        use super::*;

        #[test]
        fn default_works() {
            // Test Your Contract
        }
    }
}

Cargo.toml file is:

[package]
name = "big_number"
version = "0.1.0"
authors = ["[your_name] <[your_email]>"]
edition = "2018"

[dependencies]
ink_abi = { git = "https://github.com/chainx-org/ink", branch = "ink2.0", package = "ink_abi", default-features = false, features = ["derive"], optional = true }
ink_core = { git = "https://github.com/chainx-org/ink", branch = "ink2.0", package = "ink_core", default-features = false, features = ["old-codec"] }
ink_lang2 = { git = "https://github.com/chainx-org/ink", branch = "ink2.0", package = "ink_lang2", default-features = false, features = ["old-codec"] }

scale = { package = "parity-codec", version = "3.5", default-features = false, features = ["derive"] }
type-metadata = { git = "https://github.com/type-metadata/type-metadata.git", default-features = false, features = ["derive"], optional = true }
primitive-types = { git = "https://github.com/chainx-org/chainx-common", default-features = false, features = ["codec"] }

[lib]
name = "big_number"
path = "lib.rs"
crate-type = [
    # Used for normal contract Wasm blobs.
    "cdylib",
    # Used for ABI generation.
    "rlib",
]

[features]
default = ["test-env"]
std = [
    "ink_abi/std",
    "ink_core/std",
    "scale/std",
    "type-metadata/std",
]
test-env = [
    "std",
    "ink_core/test-env",
    "ink_lang2/test-env",
]
ink-generate-abi = [
    "std",
    "ink_abi",
    "type-metadata",
    "ink_core/ink-generate-abi",
    "ink_lang2/ink-generate-abi",
]
ink-as-dependency = []

[profile.release]
panic = "abort"
lto = true
opt-level = "z"
overflow-checks = true

[workspace]
members = [
    ".ink/abi_gen"
]
exclude = [
    ".ink"
]

When running cargo-contract contract build command --> NO ERROR --> wasm file is generated correctly

When running cargo-contract contract generate-metadata command --> I get the following ERROR:


error[E0277]: the trait bound `primitive_types::U256: type_metadata::type_id::HasTypeId` is not satisfied
--> lib.rs:8:1
|
8   | #[ink::contract(version = "0.1.0")]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `type_metadata::type_id::HasTypeId` is not implemented for `primitive_types::U256`
| 
::: /home/luca/.cargo/git/checkouts/ink-9c358e34fc403586/024347d/abi/src/specs.rs:625:12
|
625 |         T: Metadata,
|            -------- required by this bound in `ink_abi::specs::TypeSpec::with_name_segs`
|
= note: required because of the requirements on the impl of `type_metadata::Metadata` for `primitive_types::U256`

error[E0277]: the trait bound `primitive_types::U256: type_metadata::type_def::HasTypeDef` is not satisfied --> lib.rs:8:1	8	#[ink::contract(version = "0.1.0")]	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `type_metadata::type_def::HasTypeDef` is not implemented for `primitive_types::U256`

::: /home/luca/.cargo/git/checkouts/ink-9c358e34fc403586/024347d/abi/src/specs.rs:625:12	625	T: Metadata,	-------- required by this bound in `ink_abi::specs::TypeSpec::with_name_segs`

= note: required because of the requirements on the impl of `type_metadata::Metadata` for `primitive_types::U256`

error: aborting due to 2 previous errors

For more information about this error, try rustc --explain E0277. error: could not compile big_number.



Are there some suggestions to solve this ERROR?

chainx-org / chainx-common

ERROR: generate-metadata #19