feat(ranges): add is_empty function to inclusive/exclusive ranges.

src/packages/iter_basic.rs

@@ -666,6 +666,11 @@ mod range_functions {
         let _ = range;
         true
     }
+    /// Returns true if the range contains no items.
+    #[rhai_fn(get = "is_empty", name = "is_empty", pure)]
+    pub fn is_empty_exclusive(range: &mut ExclusiveRange) -> bool {
+        range.is_empty()
+    }
     /// Return the start of the inclusive range.
     #[rhai_fn(get = "start", name = "start", pure)]
     pub fn start_inclusive(range: &mut InclusiveRange) -> INT {
@@ -688,4 +693,9 @@ mod range_functions {
         let _ = range;
         false
     }
+    /// Returns true if the range contains no items.
+    #[rhai_fn(get = "is_empty", name = "is_empty", pure)]
+    pub fn is_empty_inclusive(range: &mut InclusiveRange) -> bool {
+        range.is_empty()
+    }
 }