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-rw-r--r--src/libsyntax/ext/build.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index b4b15ba31b7..59e13fdc8f1 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -858,7 +858,7 @@ impl<'a> ExtCtxt<'a> {
 
     pub fn item_ty_poly(&self, span: Span, name: Ident, ty: P<ast::Ty>,
                     generics: Generics) -> P<ast::Item> {
-        self.item(span, name, Vec::new(), ast::ItemKind::Ty(ty, generics))
+        self.item(span, name, Vec::new(), ast::ItemKind::TyAlias(ty, generics))
     }
 
     pub fn item_ty(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> P<ast::Item> {