KtFile: PackageLongNameDoubleID.kt
  PACKAGE_DIRECTIVE
    PsiElement(package)('package')
    PsiWhiteSpace(' ')
    REFERENCE_EXPRESSION
      PsiElement(IDENTIFIER)('a')
  IMPORT_LIST
    <empty list>
  PsiWhiteSpace(' ')
  PsiErrorElement:Expecting a top level declaration
    PsiElement(IDENTIFIER)('b')