Generalize and abstract `ThinAttributes`

3 files changed, 3 insertions, 3 deletions

diff --git a/src/libsyntax_ext/asm.rs b/src/libsyntax_ext/asm.rs
index 50d2b9d31fe..bae21841b5a 100644
--- a/src/libsyntax_ext/asm.rs
+++ b/src/libsyntax_ext/asm.rs
@@ -260,6 +260,6 @@ pub fn expand_asm<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
             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 09c23682cd7..71c3251c1b1 100644
--- a/src/libsyntax_ext/concat_idents.rs
+++ b/src/libsyntax_ext/concat_idents.rs
@@ -70,7 +70,7 @@ 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 d86eae820a8..3f695949b39 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(),
     });
     let decl = respan(sp, ast::DeclKind::Local(local));
     respan(sp, ast::StmtKind::Decl(P(decl), ast::DUMMY_NODE_ID))