examples/rust_example/hello_world/src/BUILD.gn

executable("hello_world") {
  sources = [
    "main.rs",
  ]
  deps = [
    "//hello_world/foo/src:foo",
  ]
  edition = "2018"
  aliased_deps = {
    baz = "//hello_world/foo/src:foo"
  }
}