YAML file: a.yml
  YAML document
    PsiElement(---)('---')
    PsiElement(Eol)('\n')
    YAML mapping
      YAML key value
        PsiElement(scalar key)('foo')
        PsiElement(:)(':')
        PsiWhiteSpace(' ')
        YAML scalar text
          PsiElement(scalar text)('>')
          PsiElement(block scalar EOL)('\n')
          PsiElement(indent)('  ')
          PsiElement(scalar text)('first text line')
          PsiElement(block scalar EOL)('\n')
          PsiElement(indent)('  ')
          PsiElement(scalar text)('second text line')
          PsiElement(block scalar EOL)('\n')
          PsiElement(block scalar EOL)('\n')
          PsiElement(indent)('  ')
          PsiElement(scalar text)('baz: clazz')
          PsiElement(block scalar EOL)('\n')
          PsiElement(indent)('  ')
          PsiElement(scalar text)('- this is text')
          PsiElement(block scalar EOL)('\n')
          PsiElement(indent)('  ')
          PsiElement(scalar text)('- but looks like a list')
          PsiElement(block scalar EOL)('\n')
          PsiElement(indent)('  ')
          PsiElement(scalar text)('- indent tells.')
      PsiElement(Eol)('\n')
      YAML key value
        PsiElement(scalar key)('bar')
        PsiElement(:)(':')
        PsiWhiteSpace(' ')
        YAML plain scalar text
          PsiElement(text)('zoo')