Update to newest haxe version.

tests/Functions.hx

@@ -0,0 +1,11 @@
+import haxe.macro.Context;
+import haxe.macro.Expr;
+using tink.MacroApi;
+
+class Functions extends Base {
+  function test() {
+    var f:Function = (macro function () {}).getFunction().sure();
+    f.asExpr('foo');
+    assertTrue(true);
+  }
+}