Use a faked-up function as a key, because functions aren't identical …

…cross-crate in Windows.

src/libsyntax/ast.rs

@@ -30,16 +30,24 @@ fn deserialize_span<D>(_d: D) -> span {
 #[auto_serialize]
 type spanned<T> = {node: T, span: span};
 
+
+/* can't import macros yet, so this is copied from token.rs. See its comment
+ * there. */
+macro_rules! interner_key (
+    () => (unsafe::transmute::<(uint, uint), &fn(+@@token::ident_interner)>(
+        (-3 as uint, 0u)))
+)
+
 fn serialize_ident<S: serializer>(s: S, i: ident) {
-    let intr = match unsafe{task::local_data_get(parse::token::interner_key)}{
+    let intr = match unsafe{task::local_data_get(interner_key!())}{
         none => fail ~"serialization: TLS interner not set up",
         some(intr) => intr
     };
 
     s.emit_str(*(*intr).get(i));
 }
 fn deserialize_ident<D: deserializer>(d: D) -> ident  {
-    let intr = match unsafe{task::local_data_get(parse::token::interner_key)}{
+    let intr = match unsafe{task::local_data_get(interner_key!())}{
         none => fail ~"deserialization: TLS interner not set up",
         some(intr) => intr
     };

src/libsyntax/parse/token.rs

@@ -325,8 +325,14 @@ mod special_idents {
 type ident_interner = util::interner::interner<@~str>;
 
 /** Key for thread-local data for sneaking interner information to the
- * serializer/deserializer. It sounds like a hack because it is one. */
-fn interner_key(+_x: @@ident_interner) { }
+ * serializer/deserializer. It sounds like a hack because it is one.
+ * Bonus ultra-hack: functions as keys don't work across crates,
+ * so we have to use a unique number. See taskgroup_key! in task.rs
+ * for another case of this. */
+macro_rules! interner_key (
+    () => (unsafe::transmute::<(uint, uint), &fn(+@@token::ident_interner)>(
+        (-3 as uint, 0u)))
+)
 
 fn mk_ident_interner() -> ident_interner {
     /* the indices here must correspond to the numbers in special_idents */
@@ -343,8 +349,8 @@ fn mk_ident_interner() -> ident_interner {
                                            |x,y| str::eq(*x, *y), init_vec);
 
     /* having multiple interners will just confuse the serializer */
-    unsafe{ assert task::local_data_get(interner_key) == none };
-    unsafe{ task::local_data_set(interner_key, @rv) };
+    unsafe{ assert task::local_data_get(interner_key!()) == none };
+    unsafe{ task::local_data_set(interner_key!(), @rv) };
     rv
 }
 

src/rustdoc/extract.rs

@@ -5,18 +5,24 @@ import doc::item_utils;
 
 export from_srv, extract, to_str, interner;
 
+
+/* can't import macros yet, so this is copied from token.rs. See its comment
+ * there. */
+macro_rules! interner_key (
+    () => (unsafe::transmute::<(uint, uint),
+           &fn(+@@syntax::parse::token::ident_interner)>((-3 as uint, 0u)))
+)
+
 // Hack; rather than thread an interner through everywhere, rely on
 // thread-local data
 fn to_str(id: ast::ident) -> ~str {
-    let intr = unsafe{ task::local_data_get(
-        syntax::parse::token::interner_key) };
+    let intr = unsafe{ task::local_data_get(interner_key!()) };
 
     return *(*intr.get()).get(id);
 }
 
 fn interner() -> syntax::parse::token::ident_interner {
-    return *(unsafe{ task::local_data_get(
-        syntax::parse::token::interner_key) }).get();
+    return *(unsafe{ task::local_data_get(interner_key!()) }).get();
 }
 
 fn from_srv(