Preserve doc comments on enum variants
diff --git a/syntax/mod.rs b/syntax/mod.rs
index 009afee..0fc7a9d 100644
--- a/syntax/mod.rs
+++ b/syntax/mod.rs
@@ -167,6 +167,7 @@
 }
 
 pub struct Variant {
+    pub doc: Doc,
     pub name: Pair,
     pub discriminant: Discriminant,
     pub expr: Option<Expr>,