Add a test for the declare_tool_lint macro

Author: flip1995

src/test/ui-fulldeps/auxiliary/lint_tool_test.rs

@@ -0,0 +1,48 @@
+// 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(plugin_registrar)]
+#![feature(box_syntax, rustc_private)]
+#![feature(macro_vis_matcher)]
+#![feature(macro_at_most_once_rep)]
+
+extern crate syntax;
+
+// Load rustc as a plugin to get macros
+#[macro_use]
+extern crate rustc;
+extern crate rustc_plugin;
+
+use rustc::lint::{EarlyContext, LintContext, LintPass, EarlyLintPass,
+                  LintArray};
+use rustc_plugin::Registry;
+use syntax::ast;
+declare_tool_lint!(pub clippy::TEST_LINT, Warn, "Warn about stuff");
+
+struct Pass;
+
+impl LintPass for Pass {
+    fn get_lints(&self) -> LintArray {
+        lint_array!(TEST_LINT)
+    }
+}
+
+impl EarlyLintPass for Pass {
+    fn check_item(&mut self, cx: &EarlyContext, it: &ast::Item) {
+        if it.ident.name == "lintme" {
+            cx.span_lint(TEST_LINT, it.span, "item is named 'lintme'");
+        }
+    }
+}
+
+#[plugin_registrar]
+pub fn plugin_registrar(reg: &mut Registry) {
+    reg.register_early_lint_pass(box Pass);
+}

src/test/ui-fulldeps/lint_tool_test.rs

@@ -0,0 +1,24 @@
+// 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.
+
+// run-pass
+// aux-build:lint_tool_test.rs
+// ignore-stage1
+#![feature(plugin)]
+#![feature(tool_lints)]
+#![plugin(lint_tool_test)]
+#![allow(dead_code)]
+
+fn lintme() { } //~ WARNING item is named 'lintme'
+
+#[allow(clippy::test_lint)]
+pub fn main() {
+    fn lintme() { }
+}

src/test/ui-fulldeps/lint_tool_test.stderr

@@ -0,0 +1,8 @@
+warning: item is named 'lintme'
+  --> $DIR/lint_tool_test.rs:19:1
+   |
+LL | fn lintme() { } //~ WARNING item is named 'lintme'
+   | ^^^^^^^^^^^^^^^
+   |
+   = note: #[warn(clippy::test_lint)] on by default
+