remove rug completely

src/machine/system_calls.rs

@@ -26,7 +26,6 @@ use crate::machine::stack::*;
 use crate::machine::streams::*;
 use crate::parser::char_reader::*;
 use crate::parser::dashu::Integer;
-use crate::parser::rug::rand::RandState;
 use crate::read::*;
 use crate::types::*;
 use rand::{Rng, SeedableRng};
@@ -93,10 +92,6 @@ use hyper_tls::HttpsConnector;
 use tokio::sync::Mutex;
 use tokio::sync::mpsc::channel;
 
-ref_thread_local! {
-    pub(crate) static managed RANDOM_STATE: RandState<'static> = RandState::new();
-}
-
 pub(crate) fn get_key() -> KeyEvent {
     let key;
     enable_raw_mode().expect("failed to enable raw mode");

src/parser/mod.rs

@@ -1,9 +1,3 @@
-#[cfg(feature = "num-rug-adapter")]
-pub use num_rug_adapter as rug;
-
-#[cfg(feature = "rug")]
-pub use rug;
-
 pub use dashu;
 
 // #[macro_use]