Add test for non ascii idents

testing/tests/test.rs

@@ -1,4 +1,6 @@
 #![cfg_attr(feature = "clippy", feature(plugin))]
 #![cfg_attr(feature = "clippy", plugin(clippy))]
 
+#![cfg_attr(feature = "unstable-testing", feature(non_ascii_idents))]
+
 include!(concat!(env!("OUT_DIR"), "/test.rs"));

testing/tests/test_gen.rs

@@ -202,6 +202,12 @@ fn test_gen() {
         EmptyStruct {},
     }
     assert::<EmptyEnumVariant>();
+
+    #[cfg(feature = "unstable-testing")]
+    #[cfg_attr(feature = "unstable-testing", derive(Serialize, Deserialize))]
+    struct NonAsciiIdents {
+        σ: f64
+    }
 }
 
 //////////////////////////////////////////////////////////////////////////