For loops!

test/while/closure_in_body.wren

@@ -0,0 +1,13 @@
+var list = []
+
+var i = 1
+while (i < 4) {
+  var j = i + 1
+  list.add(fn IO.write(j))
+  i = i + 1
+}
+
+for (f in list) f.call
+// expect: 2
+// expect: 3
+// expect: 4