PyFile:PatternMatchingSingleWildcardPattern.py
  PyMatchStatement
    PsiElement(Py:MATCH_KEYWORD)('match')
    PsiWhiteSpace(' ')
    PyReferenceExpression: x
      PsiElement(Py:IDENTIFIER)('x')
    PsiElement(Py:COLON)(':')
    PsiWhiteSpace('\n    ')
    PyCaseClause
      PsiElement(Py:CASE_KEYWORD)('case')
      PsiWhiteSpace(' ')
      PyWildcardPattern
        PsiElement(Py:IDENTIFIER)('_')
      PsiElement(Py:COLON)(':')
      PsiWhiteSpace('\n        ')
      PyStatementList
        PyPassStatement
          PsiElement(Py:PASS_KEYWORD)('pass')