added arithmetic substitution

src/prompt/highlight.rs

@@ -1,5 +1,5 @@
 use std::{env, os::unix::fs::PermissionsExt, path::{Path, PathBuf}, sync::Arc};
-use crate::{builtin::BUILTINS, prelude::*};
+use crate::builtin::BUILTINS;
 
 use rustyline::highlight::Highlighter;
 use crate::{libsh::term::{Style, StyleSet, Styled}, parse::lex::{LexFlags, LexStream, Tk, TkFlags, TkRule}, state::read_logic};

src/prompt/readline.rs

@@ -1,5 +1,3 @@
-use std::borrow::Cow;
-
 use rustyline::{completion::Completer, hint::{Hint, Hinter}, history::SearchDirection, validate::{ValidationResult, Validator}, Helper};
 
 use crate::{libsh::term::{Style, Styled}, parse::{lex::{LexFlags, LexStream}, ParseStream}};