Fix bug that consumes first argument in module-qualified call.

tests/modules.rs

@@ -94,6 +94,31 @@ fn test_module_resolver() -> Result<(), Box<EvalAltResult>> {
         42
     );
 
+    assert_eq!(
+        engine.eval::<INT>(
+            r#"
+                import "hello" as h1;
+                import "hello" as h2;
+                let x = 42;
+                h1::sum(x, -10, 3, 7)
+            "#
+        )?,
+        42
+    );
+
+    assert_eq!(
+        engine.eval::<INT>(
+            r#"
+                import "hello" as h1;
+                import "hello" as h2;
+                let x = 42;
+                h1::sum(x, 0, 0, 0);
+                x
+            "#
+        )?,
+        42
+    );
+
     assert_eq!(
         engine.eval::<INT>(
             r#"