Update.

test/await/await_fn_block_arg.wren

@@ -0,0 +1,17 @@
+// retoor <retoor@molodetz.nl>
+
+import "scheduler" for Scheduler, Future
+
+var transform = async { |list, fn|
+    var result = []
+    for (item in list) {
+        result.add(fn.call(item))
+    }
+    return result
+}
+
+var doubled = await transform([1, 2, 3]) { |x| x * 2 }
+System.print(doubled) // expect: [2, 4, 6]
+
+var squared = await transform([2, 3, 4]) { |x| x * x }
+System.print(squared) // expect: [4, 9, 16]