Allow engine to retain functions across runs.

src/scope.rs

@@ -4,7 +4,7 @@ use crate::any::{Any, Dynamic};
 use std::borrow::Cow;
 
 /// A type containing information about current scope.
-/// Useful for keeping state between `Engine` runs
+/// Useful for keeping state between `Engine` runs.
 ///
 /// # Example
 ///
@@ -15,9 +15,9 @@ use std::borrow::Cow;
 /// let mut engine = Engine::new();
 /// let mut my_scope = Scope::new();
 ///
-/// engine.eval_with_scope::<()>(&mut my_scope, "let x = 5;")?;
+/// engine.eval_with_scope::<()>(&mut my_scope, false, "let x = 5;")?;
 ///
-/// assert_eq!(engine.eval_with_scope::<i64>(&mut my_scope, "x + 1")?, 6);
+/// assert_eq!(engine.eval_with_scope::<i64>(&mut my_scope, false, "x + 1")?, 6);
 /// # Ok(())
 /// # }
 /// ```