extend type alias test to include a clean rev

Author: nikomatsakis

src/test/incremental/type_alias_cross_crate/auxiliary/a.rs

@@ -16,6 +16,10 @@ pub type X = u32;
 #[cfg(rpass2)]
 pub type X = i32;
 
+// this version doesn't actually change anything:
+#[cfg(rpass3)]
+pub type X = i32;
+
 pub type Y = char;
 
 pub fn foo() { }

src/test/incremental/type_alias_cross_crate/b.rs

@@ -9,19 +9,21 @@
 // except according to those terms.
 
 // aux-build:a.rs
-// revisions:rpass1 rpass2
+// revisions:rpass1 rpass2 rpass3
 
 #![feature(rustc_attrs)]
 
 extern crate a;
 
 #[rustc_dirty(label="TypeckItemBody", cfg="rpass2")]
+#[rustc_clean(label="TypeckItemBody", cfg="rpass3")]
 pub fn use_X() -> u32 {
     let x: a::X = 22;
     x as u32
 }
 
 #[rustc_clean(label="TypeckItemBody", cfg="rpass2")]
+#[rustc_clean(label="TypeckItemBody", cfg="rpass3")]
 pub fn use_Y() {
     let x: a::Y = 'c';
 }