KtFile: withoutFileAnnotationAndPackageDeclaration.kt
  PACKAGE_DIRECTIVE
    <empty list>
  IMPORT_LIST
    <empty list>
  FUN
    MODIFIER_LIST
      ANNOTATION_ENTRY
        PsiElement(AT)('@')
        CONSTRUCTOR_CALLEE
          TYPE_REFERENCE
            USER_TYPE
              REFERENCE_EXPRESSION
                PsiElement(IDENTIFIER)('ann')
    PsiWhiteSpace(' ')
    PsiElement(fun)('fun')
    PsiWhiteSpace(' ')
    PsiElement(IDENTIFIER)('foo')
    VALUE_PARAMETER_LIST
      PsiElement(LPAR)('(')
      PsiElement(RPAR)(')')
    PsiElement(COLON)(':')
    PsiWhiteSpace(' ')
    TYPE_REFERENCE
      NULLABLE_TYPE
        USER_TYPE
          REFERENCE_EXPRESSION
            PsiElement(IDENTIFIER)('String')
        PsiElement(QUEST)('?')
    PsiWhiteSpace(' ')
    PsiElement(EQ)('=')
    PsiWhiteSpace(' ')
    NULL
      PsiElement(null)('null')
  PsiWhiteSpace('\n\n')
  CLASS
    MODIFIER_LIST
      PsiElement(annotation)('annotation')
    PsiWhiteSpace(' ')
    PsiElement(class)('class')
    PsiWhiteSpace(' ')
    PsiElement(IDENTIFIER)('ann')