Use tokens to speed up function name lookup.

src/packages/iter_basic.rs

@@ -668,6 +668,12 @@ mod range_functions {
     pub fn is_empty_exclusive(range: &mut ExclusiveRange) -> bool {
         range.is_empty()
     }
+    /// Return `true` if the range contains a specified value.
+    #[rhai_fn(name = "contains")]
+    pub fn contains_exclusive(range: &mut ExclusiveRange, value: INT) -> bool {
+        range.contains(&value)
+    }
+
     /// Return the start of the inclusive range.
     #[rhai_fn(get = "start", name = "start", pure)]
     pub fn start_inclusive(range: &mut InclusiveRange) -> INT {
@@ -695,4 +701,9 @@ mod range_functions {
     pub fn is_empty_inclusive(range: &mut InclusiveRange) -> bool {
         range.is_empty()
     }
+    /// Return `true` if the range contains a specified value.
+    #[rhai_fn(name = "contains")]
+    pub fn contains_inclusive(range: &mut InclusiveRange, value: INT) -> bool {
+        range.contains(&value)
+    }
 }