$ cargo +stable new repro --edition=2018 $ cd repro $ cargo +stable add wasm-bindgen@=0.2.96 # =0.2.95 works $ cargo +stable check ... error[E0554]: `#![feature]` may not be used on the stable release channel  --> ~/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasm-bindgen-macro-0.2.96/src/lib.rs:4:5  | 4 | feature(allow_internal_unstable),  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ For more information about this error, try `rustc --explain E0554`. error: could not compile `wasm-bindgen-macro` (lib) due to 1 previous error $ rustc +stable --version --verbose rustc 1.83.0 (90b35a623 2024-11-26) binary: rustc commit-hash: 90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf commit-date: 2024-11-26 host: x86_64-unknown-linux-gnu release: 1.83.0 LLVM version: 19.1.1