{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"#[derive(Debug,"}]}
#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
/// [param_env_guide]: https://rustc-dev-guide.rust-lang.org/typing_parameter_envs.html
#[derive(HashStable, TypeVisitable, TypeFoldable)]