Fix tests

Conflicts:
	src/test/compile-fail/associated-types-overridden-default.rs
	src/test/compile-fail/issue-23595-1.rs
	src/test/compile-fail/issue-23595-2.rs

Author: brson

src/test/compile-fail/issue-23073.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(associated_type_defaults)]
+
 trait Foo { type T; }
 trait Bar {
     type Foo: Foo;

src/test/compile-fail/lint-missing-doc.rs

@@ -12,6 +12,7 @@
 // injected intrinsics by the compiler.
 #![deny(missing_docs)]
 #![allow(dead_code)]
+#![feature(associated_type_defaults)]
 
 //! Some garbage docs for the crate here
 #![doc="More garbage"]