rustc: Implement "deriving" for monomorphic structs via a syntax extension. r=brson

src/test/run-pass/deriving-via-extension-c-enum.rs

@@ -0,0 +1,16 @@
+#[deriving_eq]
+enum Foo {
+    Bar,
+    Baz,
+    Boo
+}
+
+fn main() {
+    let a = Bar;
+    let b = Bar;
+    assert a == b;
+    assert !(a != b);
+    assert a.eq(&b);
+    assert !a.ne(&b);
+}
+

src/test/run-pass/deriving-via-extension-struct.rs

@@ -0,0 +1,16 @@
+#[deriving_eq]
+struct Foo {
+    x: int,
+    y: int,
+    z: int,
+}
+
+fn main() {
+    let a = Foo { x: 1, y: 2, z: 3 };
+    let b = Foo { x: 1, y: 2, z: 3 };
+    assert a == b;
+    assert !(a != b);
+    assert a.eq(&b);
+    assert !a.ne(&b);
+}
+