PyFile:PatternMatchingValuePatternStartingWithUnderscore.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(' ')
      PyValuePattern
        PyReferenceExpression: bar
          PyReferenceExpression: foo
            PyReferenceExpression: _
              PsiElement(Py:IDENTIFIER)('_')
            PsiElement(Py:DOT)('.')
            PsiElement(Py:IDENTIFIER)('foo')
          PsiElement(Py:DOT)('.')
          PsiElement(Py:IDENTIFIER)('bar')
      PsiElement(Py:COLON)(':')
      PsiWhiteSpace('\n        ')
      PyStatementList
        PyPassStatement
          PsiElement(Py:PASS_KEYWORD)('pass')