Rust Build error

[bucanero]

From a fresh repo clone, when running cargo near build, the build fails with the following error:

 │    Compiling near-crypto v0.27.0
 │ error[E0658]: use of unstable library feature 'lazy_cell'
 │   --> /Users/dparrino/.cargo/registry/src/index.crates.io-6f17d22bba15001f/near-crypto-0.27.0/src/signature.rs:12:5
 │    |
 │ 12 | use std::sync::LazyLock;
 │    |     ^^^^^^^^^^^^^^^^^^^
 │    |
 │    = note: see issue #109736 <https://github.com/rust-lang/rust/issues/109736> for more information
 │
 │ error[E0658]: use of unstable library feature 'lazy_cell'
 │   --> /Users/dparrino/.cargo/registry/src/index.crates.io-6f17d22bba15001f/near-crypto-0.27.0/src/signature.rs:14:23
 │    |
 │ 14 | pub static SECP256K1: LazyLock<secp256k1::Secp256k1<secp256k1::All>> =
 │    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 │    |
 │    = note: see issue #109736 <https://github.com/rust-lang/rust/issues/109736> for more information
 │
...

[frol]

Try upgrading your Rust compiler: rustup update stable

[bucanero]

Try upgrading your Rust compiler: rustup update stable

Thanks @frol !🙏 updating the stable toolchain fixed the issue.
(I had rustc 1.80.0 , and now, after installing 1.83.0, the NFT contract was built successfully)

I'll update the ReadMe and add a note so users are aware and can update their Rust environment.