impl<'a> TraitDef<'a> {
pub fn expand(&self,
cx: &mut ExtCtxt,
- _mitem: &ast::MetaItem,
+ mitem: &ast::MetaItem,
item: &ast::Item,
push: |P<ast::Item>|) {
let newitem = match item.node {
item.ident,
generics)
}
- _ => return
+ _ => {
+ cx.span_err(mitem.span, "`deriving` may only be applied to structs and enums");
+ return;
+ }
};
// Keep the lint attributes of the previous item to control how the
// generated implementations are linted
--- /dev/null
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![allow(dead_code)]
+
+struct S;
+
+#[deriving(PartialEq)] //~ ERROR: `deriving` may only be applied to structs and enums
+trait T { }
+
+#[deriving(PartialEq)] //~ ERROR: `deriving` may only be applied to structs and enums
+impl S { }
+
+#[deriving(PartialEq)] //~ ERROR: `deriving` may only be applied to structs and enums
+impl T for S { }
+
+#[deriving(PartialEq)] //~ ERROR: `deriving` may only be applied to structs and enums
+static s: uint = 0u;
+
+#[deriving(PartialEq)] //~ ERROR: `deriving` may only be applied to structs and enums
+const c: uint = 0u;
+
+#[deriving(PartialEq)] //~ ERROR: `deriving` may only be applied to structs and enums
+mod m { }
+
+#[deriving(PartialEq)] //~ ERROR: `deriving` may only be applied to structs and enums
+extern "C" { }
+
+#[deriving(PartialEq)] //~ ERROR: `deriving` may only be applied to structs and enums
+type A = uint;
+
+#[deriving(PartialEq)] //~ ERROR: `deriving` may only be applied to structs and enums
+fn main() { }