More nested function fun! (0.40.1)

examples/functions/nested_no_capture.fun

@@ -0,0 +1,41 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2026 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2026-04-02
+ */
+
+/*
+ * Demonstrates nested functions that are only visible inside the
+ * outer function where they are defined. This example avoids
+ * capturing outer variables (closures) and instead passes values
+ * explicitly, which works with the current implementation.
+ */
+
+print("=== Nested (no captures), explicit parameters ===")
+
+fun outer(a, b)
+  fun mul3(x)
+    return x * 3
+
+  fun combine(x, y)
+    return x + y + 1
+
+  ax = mul3(a)
+  by = mul3(b)
+  return combine(ax, by)
+
+print("outer(2, 5) -> expected 2*3 + 5*3 + 1 = 22")
+print(outer(2, 5))
+
+/* Expected output:
+=== Nested (no captures), explicit parameters ===
+outer(2, 5) -> expected 2*3 + 5*3 + 1 = 22
+22
+*/