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/bindgen/BUILD.bazel b/examples/bindgen/BUILD.bazel
new file mode 100644
index 0000000..1a62c78
--- /dev/null
+++ b/examples/bindgen/BUILD.bazel
@@ -0,0 +1,52 @@
+load("@rules_cc//cc:defs.bzl", "cc_library")
+load("@rules_rust//bindgen:bindgen.bzl", "rust_bindgen_library")
+load("@rules_rust//rust:defs.bzl", "rust_binary", "rust_test")
+
+cc_library(
+    name = "simple",
+    srcs = ["simple.h"],
+)
+
+rust_bindgen_library(
+    name = "simple_bindgen",
+    bindgen_flags = [
+        "--allowlist-var=SIMPLE_.*",
+    ],
+    cc_lib = ":simple",
+    header = "simple.h",
+)
+
+rust_binary(
+    name = "simple_example",
+    srcs = ["main.rs"],
+    deps = [":simple_bindgen"],
+)
+
+rust_test(
+    name = "simple_test",
+    crate = ":simple_example",
+)
+
+# Same as above, except disabling formatting on bindgen.
+rust_bindgen_library(
+    name = "simple_bindgen_unformatted",
+    bindgen_flags = [
+        "--allowlist-var=SIMPLE_.*",
+    ],
+    cc_lib = ":simple",
+    crate_name = "simple_bindgen",
+    header = "simple.h",
+    rustfmt = False,
+)
+
+rust_binary(
+    name = "simple_example_unformatted",
+    srcs = ["main.rs"],
+    crate_name = "simple_example",
+    deps = [":simple_bindgen_unformatted"],
+)
+
+rust_test(
+    name = "simple_test_unformatted",
+    crate = ":simple_example_unformatted",
+)
diff --git a/examples/bindgen/main.rs b/examples/bindgen/main.rs
new file mode 100644
index 0000000..fb93ce4
--- /dev/null
+++ b/examples/bindgen/main.rs
@@ -0,0 +1,11 @@
+fn main() {
+    println!("The value is {}!", simple_bindgen::SIMPLE_VALUE);
+}
+
+#[cfg(test)]
+mod test {
+    #[test]
+    fn do_the_test() {
+        assert_eq!(42, simple_bindgen::SIMPLE_VALUE);
+    }
+}
diff --git a/examples/bindgen/simple.h b/examples/bindgen/simple.h
new file mode 100644
index 0000000..072f9ea
--- /dev/null
+++ b/examples/bindgen/simple.h
@@ -0,0 +1,3 @@
+#include <stdint.h>
+
+const int64_t SIMPLE_VALUE = 42;