add another test

Author: penelopeysm

tests/e2e/functions.lox

@@ -0,0 +1,10 @@
+fun foo(a, b) {
+    print a + b;
+}
+
+fun a1() { a2(); }
+fun a2() { a3(); }
+fun a3() { a4(); }
+fun a4() { foo(1, 2); }
+
+a1();

tests/e2e/functions.out

@@ -0,0 +1 @@
+3