Function can_rewrite 

fn can_rewrite(
    path: &Path,
    source_path: &Path,
    root_dir: &Path,
    source_units: &[PathBuf],
    remappings: &[Remapping],
    has_constructor_args: bool,
    contract_id: ContractId,
) -> bool

Returns whether generated helper and artifact references preserve the source-unit identity.