Introduce the new phantomdata/phantomfn markers and integrate them

into variance inference; fix various bugs in variance inference
so that it considers the correct set of constraints; modify infer to
consider the results of variance inference for type arguments.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index 67c8c9fec09..a2c1bbc0331 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -16,7 +16,7 @@ use any;
 use cell::{Cell, RefCell, Ref, RefMut, BorrowState};
 use char::CharExt;
 use iter::{Iterator, IteratorExt};
-use marker::{Copy, Sized};
+use marker::{Copy, PhantomData, Sized};
 use mem;
 use option::Option;
 use option::Option::{Some, None};
@@ -914,6 +914,11 @@ impl Debug for () {
         f.pad("()")
     }
 }
+impl<T> Debug for PhantomData<T> {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        f.pad("PhantomData")
+    }
+}
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Copy + Debug> Debug for Cell<T> {