3 files changed, 3 insertions, 3 deletions
diff --git a/src/libsyntax_ext/asm.rs b/src/libsyntax_ext/asm.rs
index e9e72c040fe..56a8c28ffed 100644
--- a/src/libsyntax_ext/asm.rs
+++ b/src/libsyntax_ext/asm.rs
@@ -261,6 +261,6 @@ pub fn expand_asm<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[tokenstream::Token
             expn_id: expn_id,
         }),
         span: sp,
-        attrs: None,
+        attrs: ast::ThinVec::new(),
     }))
 }
diff --git a/src/libsyntax_ext/concat_idents.rs b/src/libsyntax_ext/concat_idents.rs
index 2be32d33345..870413a7f61 100644
--- a/src/libsyntax_ext/concat_idents.rs
+++ b/src/libsyntax_ext/concat_idents.rs
@@ -71,7 +71,7 @@ pub fn expand_syntax_ext<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[TokenTree])
                 id: ast::DUMMY_NODE_ID,
                 node: ast::ExprKind::Path(None, self.path()),
                 span: self.span,
-                attrs: None,
+                attrs: ast::ThinVec::new(),
             }))
         }
 
diff --git a/src/libsyntax_ext/deriving/debug.rs b/src/libsyntax_ext/deriving/debug.rs
index 527748149a7..dabe234eb9c 100644
--- a/src/libsyntax_ext/deriving/debug.rs
+++ b/src/libsyntax_ext/deriving/debug.rs
@@ -149,7 +149,7 @@ fn stmt_let_undescore(cx: &mut ExtCtxt,
         init: Some(expr),
         id: ast::DUMMY_NODE_ID,
         span: sp,
-        attrs: None,
+        attrs: ast::ThinVec::new(),
     });
     ast::Stmt {
         id: ast::DUMMY_NODE_ID,