Add tests for a new feature 'tool_attributes'

src/test/compile-fail/feature-gate-tool_attributes.rs

@@ -0,0 +1,15 @@
+// Copyright 2018 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.
+
+fn main() {
+    #[rustfmt::skip] //~ ERROR scoped attribute `rustfmt::skip` is experimental
+    let x =
+        3;
+}

src/test/compile-fail/unknown-tool-name.rs

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+// Copyright 2018 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.
+
+#![feature(tool_attributes)]
+
+#![foo::bar] //~ ERROR An unkown tool name found in scoped attributes: `foo::bar`. [E0693]
+
+#[foo::bar] //~ ERROR An unkown tool name found in scoped attributes: `foo::bar`. [E0693]
+fn main() {}

src/test/compile-fail/unknown_tool_attributes-1.rs

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+// Copyright 2018 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.
+
+// Make sure that 'custom_attributes' feature does not allow scoped attributes.
+
+#![feature(custom_attributes)]
+
+#[foo::bar]
+//~^ ERROR scoped attribute `foo::bar` is experimental (see issue #44690) [E0658]
+//~^^ ERROR An unkown tool name found in scoped attributes: `foo::bar`. [E0693]
+fn main() {}

src/test/run-pass/tool_attributes.rs

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+// Copyright 2018 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.
+
+// Scoped attributes should not trigger an unused attributes lint.
+
+#![feature(tool_attributes)]
+#![deny(unused_attributes)]
+
+fn main() {
+    #[rustfmt::skip]
+    foo ();
+}
+
+fn foo() {
+    assert!(true);
+}

src/test/ui/feature-gate-tool_attributes.rs

@@ -0,0 +1,15 @@
+// Copyright 2018 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.
+
+fn main() {
+    #[rustfmt::skip] //~ ERROR scoped attribute `rustfmt::skip` is experimental
+    let x = 3
+        ;
+}

src/test/ui/feature-gate-tool_attributes.stderr

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+error[E0658]: scoped attribute `rustfmt::skip` is experimental (see issue #44690)
+  --> $DIR/feature-gate-tool_attributes.rs:12:5
+   |
+12 |     #[rustfmt::skip] //~ ERROR scoped attribute `rustfmt::skip` is experimental
+   |     ^^^^^^^^^^^^^^^^
+   |
+   = help: add #![feature(tool_attributes)] to the crate attributes to enable
+
+error: aborting due to previous error
+