Diagnose when test features are missing
diff --git a/tests/test_asyncness.rs b/tests/test_asyncness.rs
index b73537b..78bee8c 100644
--- a/tests/test_asyncness.rs
+++ b/tests/test_asyncness.rs
@@ -6,11 +6,11 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
-#![cfg(all(feature = "extra-traits", feature = "full"))]
-
extern crate proc_macro2;
extern crate syn;
+mod features;
+
use proc_macro2::Span;
use syn::punctuated::Punctuated;
use syn::{Block, Expr, ExprBlock, ExprClosure, FnDecl, Ident, ItemFn, ReturnType, Visibility};