use the type name as the pass name

src/librustc/lib.rs

@@ -28,6 +28,7 @@
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(const_fn)]
+#![feature(core_intrinsics)]
 #![feature(enumset)]
 #![feature(iter_arith)]
 #![feature(libc)]

src/librustc/mir/transform.rs

@@ -76,7 +76,9 @@ pub trait Pass {
     fn dep_node(&self, def_id: DefId) -> DepNode<DefId> {
         DepNode::MirPass(def_id)
     }
-    fn name(&self) -> &str;
+    fn name(&self) -> &str {
+        unsafe { ::std::intrinsics::type_name::<Self>() }
+    }
     fn disambiguator<'a>(&'a self) -> Option<Box<fmt::Display+'a>> { None }
 }