Update for changes in rustc master.

src/interpreter.rs

@@ -1179,7 +1179,7 @@ pub fn get_impl_method<'tcx>(
             }
         }
         None => {
-            tcx.sess.bug(&format!("method {:?} not found in {:?}", name, impl_def_id))
+            bug!("method {:?} not found in {:?}", name, impl_def_id);
         }
     }
 }

src/lib.rs

@@ -2,7 +2,7 @@
 
 // From rustc.
 extern crate arena;
-extern crate rustc;
+#[macro_use] extern crate rustc;
 extern crate rustc_data_structures;
 extern crate rustc_mir;
 extern crate syntax;