Add basic rustc example

examples/rust/.buckconfig

@@ -0,0 +1,5 @@
+[buildfile]
+name=TARGETS
+
+[repositories]
+root = .

examples/rust/rules.bzl

@@ -0,0 +1,17 @@
+def _rust_binary_impl(ctx):
+    file = ctx.attr.file
+    out = ctx.actions.declare_output("main")
+
+    cmd = cmd_args(["rustc", "--crate-type=bin", file, "-o", out.as_output()])
+
+    ctx.actions.run(cmd, category="compile")
+
+    return [DefaultInfo(default_outputs = [out]), RunInfo(args=cmd_args([out]))]
+
+
+rust_binary = rule(
+    implementation = _rust_binary_impl,
+    attrs = {
+        "file": attr.source()
+    },
+)

examples/rust/rustc/TARGETS

@@ -0,0 +1,6 @@
+load("//rules.bzl", "rust_binary")
+
+rust_binary(
+    name = "main",
+    file = "./main.rs"
+)

examples/rust/rustc/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("hello from rustc");
+}