This crate requires a nightly (unstable, experimental) compiler version. To switch to it, you must have Rust installed via Rustup, and run:
rustup default nightly
Run rustup default stable to switch back.
Adding ex3_node_types library as a dependency
Run this command in a terminal, in your project's directory:
cargo add ex3-node-types
To add it manually, edit your project's Cargo.toml file and add to the [dependencies] section:
ex3-node-types = "0.15.166"
The ex3_node_types library will be automatically available globally.
Read the ex3_node_types library documentation.