# `compile_one()` is a private method in a large CGU.
# `is_valid_cap_letter()` is a private function in a small CGU.
# `expand()` is a public function in a small CGU.
# `new()` is a public method in a large CGU called in one other module
# `BYTE_FREQUENCIES` is a public static used in one other module
# `sparse::SparseSet` is a struct used in two other modules
# `backtrack::Job` is a local enum used in one module
