partition TEST { // or .test.lang filename
  decl something : Unit -> Unit
}

partition INTERFACE { // or .interface.lang filename
  decl something : Unit -> Unit
}

partition CORE { // or .core.lang filename
  decl something : Unit -> Unit
}

partition LIB { // or .lib.lang filename
  decl something : Unit -> Unit
}

partition MODULE { // or .module.lang filename
  decl something : Unit -> Unit
}

partition EXE { // or .exe.lang filename
  decl something : Unit -> Unit
}