my sub modules-in-dist1( $directory ) {
  gather {
    try {
      for $directory.child('dist').IO.dir.grep(*.IO.f) -> $idx-file {
        take modules-in-idx-file( $idx-file );
      }
    }
  }.flat
}

my sub modules-in-dist2( $directory ) {
  try {
    $directory.child('dist').IO.dir.grep(*.IO.f).map(-> $idx-file {
      |modules-in-idx-file( $idx-file );
    });
  }
}