Squashed 'third_party/rules_rust/' content from commit bf59038ca

git-subtree-dir: third_party/rules_rust
git-subtree-split: bf59038cac11798cbaef9f3bf965bad8182b97fa
Signed-off-by: Brian Silverman <bsilver16384@gmail.com>
Change-Id: I5a20e403203d670df467ea97dde9a4ac40339a8d
diff --git a/examples/hello_lib/BUILD.bazel b/examples/hello_lib/BUILD.bazel
new file mode 100644
index 0000000..e8fb6f6
--- /dev/null
+++ b/examples/hello_lib/BUILD.bazel
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+load("@rules_rust//rust:defs.bzl", "rust_analyzer", "rust_doc", "rust_doc_test", "rust_library", "rust_shared_library", "rust_static_library", "rust_test")
+
+package(default_visibility = ["//visibility:public"])
+
+rust_library(
+    name = "hello_lib",
+    srcs = [
+        "src/greeter.rs",
+        "src/lib.rs",
+    ],
+    crate_features = ["default"],
+    rustc_flags = ["--cap-lints=allow"],
+)
+
+rust_shared_library(
+    name = "hello_cdylib",
+    srcs = [
+        "src/greeter.rs",
+        "src/lib.rs",
+    ],
+)
+
+rust_static_library(
+    name = "hello_staticlib",
+    srcs = [
+        "src/greeter.rs",
+        "src/lib.rs",
+    ],
+)
+
+# Regression test for #368: static lib with dependencies fail.
+rust_static_library(
+    name = "hello_test_staticlib",
+    srcs = [
+        "tests/greeting.rs",
+    ],
+    deps = [":hello_lib"],
+)
+
+# Regression test for #368: cdylib lib with dependencies fail.
+rust_shared_library(
+    name = "hello_test_cdylib",
+    srcs = [
+        "tests/greeting.rs",
+    ],
+    deps = [":hello_lib"],
+)
+
+rust_test(
+    name = "hello-lib-test",
+    crate = ":hello_lib",
+)
+
+rust_test(
+    name = "greeting_test",
+    srcs = ["tests/greeting.rs"],
+    deps = [":hello_lib"],
+)
+
+rust_doc(
+    name = "hello_lib_doc",
+    crate = ":hello_lib",
+)
+
+rust_doc_test(
+    name = "hello_lib_doc_test",
+    crate = ":hello_lib",
+)
+
+rust_analyzer(
+    name = "hello_rust_analyzer",
+    targets = [":hello_lib"],
+)
diff --git a/examples/hello_lib/src/greeter.rs b/examples/hello_lib/src/greeter.rs
new file mode 100644
index 0000000..4a90415
--- /dev/null
+++ b/examples/hello_lib/src/greeter.rs
@@ -0,0 +1,75 @@
+// Copyright 2015 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/// Object that displays a greeting.
+pub struct Greeter {
+    greeting: String,
+}
+
+/// Implementation of Greeter.
+impl Greeter {
+    /// Constructs a new `Greeter`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use hello_lib::greeter::Greeter;
+    ///
+    /// let greeter = Greeter::new("Hello");
+    /// ```
+    pub fn new(greeting: &str) -> Greeter {
+        Greeter {
+            greeting: greeting.to_string(),
+        }
+    }
+
+    /// Returns the greeting as a string.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use hello_lib::greeter::Greeter;
+    ///
+    /// let greeter = Greeter::new("Hello");
+    /// let greeting = greeter.greeting("World");
+    /// ```
+    pub fn greeting(&self, thing: &str) -> String {
+        format!("{} {}", &self.greeting, thing)
+    }
+
+    /// Prints the greeting.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use hello_lib::greeter::Greeter;
+    ///
+    /// let greeter = Greeter::new("Hello");
+    /// greeter.greet("World");
+    /// ```
+    pub fn greet(&self, thing: &str) {
+        println!("{} {}", &self.greeting, thing);
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::Greeter;
+
+    #[test]
+    fn test_greeting() {
+        let hello = Greeter::new("Hi");
+        assert_eq!("Hi Rust", hello.greeting("Rust"));
+    }
+}
diff --git a/examples/hello_lib/src/lib.rs b/examples/hello_lib/src/lib.rs
new file mode 100644
index 0000000..9dc6089
--- /dev/null
+++ b/examples/hello_lib/src/lib.rs
@@ -0,0 +1,15 @@
+// Copyright 2015 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+pub mod greeter;
diff --git a/examples/hello_lib/tests/greeting.rs b/examples/hello_lib/tests/greeting.rs
new file mode 100644
index 0000000..6084d13
--- /dev/null
+++ b/examples/hello_lib/tests/greeting.rs
@@ -0,0 +1,27 @@
+// Copyright 2015 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate hello_lib;
+
+// test gate is not usually required in an integration test, but the BUILD
+// script is using this file to test cdylib compilation as well, and when
+// compiled in that mode, greeter is an unused import.
+#[cfg(test)]
+use hello_lib::greeter;
+
+#[test]
+fn test_greeting() {
+    let hello = greeter::Greeter::new("Hello");
+    assert_eq!("Hello world", hello.greeting("world"));
+}