YAML file: CommentInBlockScalarHeader.yml
  YAML document
    YAML sequence
      YAML sequence item
        PsiElement(-)('-')
        PsiWhiteSpace(' ')
        YAML scalar text
          PsiElement(scalar text)('>')
          PsiWhiteSpace('  ')
          PsiComment(comment)('# comment in folded style block scalar header')
          PsiElement(block scalar EOL)('\n')
          PsiElement(indent)('   ')
          PsiElement(scalar text)('hello')
          PsiElement(block scalar EOL)('\n')
          PsiElement(indent)('   ')
          PsiElement(scalar text)('world')
      PsiElement(Eol)('\n')
      YAML sequence item
        PsiElement(-)('-')
        PsiWhiteSpace(' ')
        YAML scalar list
          PsiElement(scalar list)('|')
          PsiWhiteSpace(' ')
          PsiComment(comment)('# comment in literal style block scalar header')
          PsiElement(block scalar EOL)('\n')
          PsiElement(indent)('   ')
          PsiElement(scalar list)('forever')
          PsiElement(block scalar EOL)('\n')
          PsiElement(indent)('   ')
          PsiElement(scalar list)('young')