From 675caa82278d90da8339c6221fa93b9f0ba7ef4f Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sun, 12 Jun 2016 16:10:47 -0700
Subject: [PATCH] Add test for expansion inside of cfg_attr

---
 serde_tests/tests/test_macros.rs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/serde_tests/tests/test_macros.rs b/serde_tests/tests/test_macros.rs
index 491acca205..72a768455f 100644
--- a/serde_tests/tests/test_macros.rs
+++ b/serde_tests/tests/test_macros.rs
@@ -14,9 +14,20 @@ trait Trait {
 #[deny(unused_variables)]
 enum Void {}
 
-#[derive(Debug, PartialEq, Serialize, Deserialize)]
+// Test that `derive` expansion works inside of `cfg_attr`. The `all()` is
+// equivalent to true. This struct is used below in a way that requires it to
+// implement all four traits.
+#[cfg_attr(all(), derive(Debug, PartialEq, Serialize, Deserialize))]
 struct NamedUnit;
 
+// Test that `derive` expansion pays attention to the `cfg_attr`. The `any()`
+// is equivalent to false.
+#[allow(dead_code)]
+struct NotSerializable;
+#[allow(dead_code)]
+#[cfg_attr(any(), derive(Serialize))]
+struct AlsoNotSerializable(NotSerializable);
+
 #[derive(Debug, PartialEq, Serialize)]
 struct SerNamedTuple<'a, 'b, A: 'a, B: 'b, C>(&'a A, &'b mut B, C);