side effects!

src/run.rs

@@ -226,4 +226,31 @@ mod tests {
 		assert_eq!(scope.get("foo"), Some(42.into()));
 		assert_eq!(scope.get("bar"), None);
 	}
+
+	#[test]
+	fn test_call_statement() {
+		let mut scope = Scope::default();
+		scope.add_fn("set", |scope, args| {
+			let [key, value] = args.as_slice() else {
+				panic!("exactly two arguments expected");
+			};
+			let Some(ValueInner::String(key)) = key else {
+				panic!("string expected");
+			};
+			scope.set(key.clone(), value.clone());
+			None
+		});
+		assert_eq!(scope.get("foo"), None);
+		assert_eq!(scope.get("bar"), None);
+		ast::Statement::Call {
+			callee: "set".into(),
+			args: vec![
+				ast::Expression::Constant(ast::Constant::String("foo".into())),
+				ast::Expression::Constant(ast::Constant::Number(42)),
+			],
+		}
+		.exec(&mut scope);
+		assert_eq!(scope.get("foo"), Some(42.into()));
+		assert_eq!(scope.get("bar"), None);
+	}
 }