def METHOD_NAME(rule_runner: RuleRunner) -> None:
    files = {
        "foo.py": "# Copyright 1853\n...",
        "foo.rs": "// Copyright 1853\n...",
        "sub/foo.py": "# Copyright 1853\n...",
        "sub/foo.rs": "// Copyright 1853\n...",
    }
    rule_runner.write_files(files)
    fmt_result = run_preamble(
        rule_runner,
        {
            "**/*.py": "# Copyright $year\n",
            "**/*.rs": "// Copyright $year\n",
        },
    )
    assert fmt_result.output == rule_runner.make_snapshot(files)
    assert fmt_result.did_change is False