KtFile: OnlyBy.kt
  PACKAGE_DIRECTIVE
    <empty list>
  IMPORT_LIST
    <empty list>
  PROPERTY
    PsiElement(val)('val')
    PsiWhiteSpace(' ')
    PsiElement(IDENTIFIER)('a')
    PsiWhiteSpace(' ')
    PROPERTY_DELEGATE
      PsiElement(by)('by')
      PsiErrorElement:Expecting an expression
        <empty list>
  PsiWhiteSpace('\n\n')
  PROPERTY
    PsiElement(val)('val')
    PsiWhiteSpace(' ')
    PsiElement(IDENTIFIER)('b')
    PsiWhiteSpace(' ')
    PsiElement(EQ)('=')
    PsiWhiteSpace(' ')
    INTEGER_CONSTANT
      PsiElement(INTEGER_LITERAL)('1')