1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui-fulldeps/issue-14021.rs b/src/test/ui-fulldeps/issue-14021.rs
new file mode 100644
index 000000000..215dfaed7
--- /dev/null
+++ b/src/test/ui-fulldeps/issue-14021.rs
@@ -0,0 +1,28 @@
+// run-pass
+
+#![allow(unused_mut)]
+#![allow(unused_imports)]
+#![feature(rustc_private)]
+
+extern crate rustc_macros;
+extern crate rustc_serialize;
+
+use rustc_macros::{Decodable, Encodable};
+use rustc_serialize::opaque::{MemDecoder, MemEncoder};
+use rustc_serialize::{Decodable, Encodable, Encoder};
+
+#[derive(Encodable, Decodable, PartialEq, Debug)]
+struct UnitLikeStruct;
+
+pub fn main() {
+    let obj = UnitLikeStruct;
+
+    let mut encoder = MemEncoder::new();
+    obj.encode(&mut encoder);
+    let data = encoder.finish();
+
+    let mut decoder = MemDecoder::new(&data, 0);
+    let obj2 = UnitLikeStruct::decode(&mut decoder);
+
+    assert_eq!(obj, obj2);
+}