test for register_attribute()

Author: Manishearth

src/test/auxiliary/attr_plugin_test.rs

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+// Copyright 2014 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.
+
+// force-host
+
+#![feature(plugin_registrar)]
+#![feature(rustc_private)]
+
+extern crate syntax;
+
+extern crate rustc;
+
+use syntax::feature_gate::AttributeType;
+use rustc::plugin::Registry;
+
+
+
+#[plugin_registrar]
+pub fn plugin_registrar(reg: &mut Registry) {
+    reg.register_attribute("foo".to_owned(), AttributeType::Normal);
+    reg.register_attribute("bar".to_owned(), AttributeType::CrateLevel);
+    reg.register_attribute("baz".to_owned(), AttributeType::Whitelisted);
+}

src/test/compile-fail-fulldeps/plugin-attr-register-deny.rs

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+// Copyright 2014 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.
+
+// aux-build:attr_plugin_test.rs
+// ignore-stage1
+
+#![feature(plugin)]
+#![plugin(attr_plugin_test)]
+#![deny(unused_attributes)]
+
+#[baz]
+fn baz() { } // no error
+
+#[foo]
+pub fn main() {
+     //~^^ ERROR unused
+    #[bar]
+    fn inner() {}
+    //~^^ ERROR crate
+    //~^^^ ERROR unused
+    baz();
+    inner();
+}