Add some tests for stability stuff

Author: brson

src/test/compile-fail/enable-unstable-lib-feature.rs

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+// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Test that enabling an unstable feature disables warnings
+
+// aux-build:stability_cfg2.rs
+
+#![feature(unnamed_feature)]
+#![deny(non_snake_case)] // To trigger a hard error
+
+// Shouldn't generate a warning about unstable features
+extern crate stability_cfg2;
+
+pub fn BOGUS() { } //~ ERROR
+
+pub fn main() { }

src/test/compile-fail/lint-unknown-feature-default.rs

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+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Tests the default for the unused_features lint
+
+#![feature(this_is_not_a_feature)] //~ ERROR: unused or unknown feature
+
+fn main() { }