Add DebuggingPackage.

tests/debugging.rs

@@ -0,0 +1,34 @@
+#![cfg(feature = "debugging")]
+use rhai::{Engine, EvalAltResult, INT};
+
+#[cfg(not(feature = "no_index"))]
+use rhai::Array;
+
+#[test]
+fn test_debugging() -> Result<(), Box<EvalAltResult>> {
+    let engine = Engine::new();
+
+    #[cfg(not(feature = "no_function"))]
+    #[cfg(not(feature = "no_index"))]
+    {
+        let r = engine.eval::<Array>(
+            "
+                fn foo(x) {
+                    if x >= 5 {
+                        stack_trace()
+                    } else {
+                        foo(x+1)
+                    }
+                }
+
+                foo(0)
+            ",
+        )?;
+
+        assert_eq!(r.len(), 6);
+
+        assert_eq!(engine.eval::<INT>("len(stack_trace())")?, 0);
+    }
+
+    Ok(())
+}