{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":".map(PathBuf::from)"}]}
                        .map(PathBuf::from)
                    env_var: std::env::var_os("RUSTC_ICE")
                        .map(|env_var| session_diagnostics::IcePathErrorEnv { env_var }),