---

yaml
---
r: 79440
b: refs/heads/snap-stage3
c: 77c96d7
h: refs/heads/master
v: v3

Author: jbclements

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: 124eb2119c78651cfaaa7a046a101fa2e20f83ca
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
-refs/heads/snap-stage3: 6e3b2ab44d9c03fb7aa8e8b94e711c197de3d337
+refs/heads/snap-stage3: 77c96d754e3a5d4b8dd59269b0cb0324350ccbec
 refs/heads/try: ac820906c0e53eab79a98ee64f7231f57c3887b4
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b

branches/snap-stage3/src/libsyntax/ast.rs

@@ -24,14 +24,27 @@ use extra::serialize::{Encodable, Decodable, Encoder, Decoder};
 // table) and a SyntaxContext to track renaming and
 // macro expansion per Flatt et al., "Macros
 // That Work Together"
-#[deriving(Clone, Eq, IterBytes, ToStr)]
+#[deriving(Clone, IterBytes, ToStr)]
 pub struct Ident { name: Name, ctxt: SyntaxContext }
 
 impl Ident {
     /// Construct an identifier with the given name and an empty context:
     pub fn new(name: Name) -> Ident { Ident {name: name, ctxt: EMPTY_CTXT}}
 }
 
+impl Eq for Ident {
+    fn eq(&self, other: &Ident) -> bool {
+        if (self.ctxt == other.ctxt) {
+            self.name == other.name
+        } else {
+            fail!(fmt!("not allowed to compare these idents: %?, %?", self, other));
+        }
+    }
+    fn ne(&self, other: &Ident) -> bool {
+        ! self.eq(other)
+    }
+}
+
 /// A SyntaxContext represents a chain of macro-expandings
 /// and renamings. Each macro expansion corresponds to
 /// a fresh uint