PyFile:YieldStatement.py
  PyFunction('f')
    PsiElement(Py:DEF_KEYWORD)('def')
    PsiWhiteSpace(' ')
    PsiElement(Py:IDENTIFIER)('f')
    PyParameterList
      PsiElement(Py:LPAR)('(')
      PsiElement(Py:RPAR)(')')
    PsiElement(Py:COLON)(':')
    PsiWhiteSpace('\n  ')
    PyStatementList
      PyExpressionStatement
        PyYieldExpression
          PsiElement(Py:YIELD_KEYWORD)('yield')
          PsiWhiteSpace(' ')
          PyNumericLiteralExpression
            PsiElement(Py:INTEGER_LITERAL)('42')
  PsiWhiteSpace('\n\n')
  PyExpressionStatement
    PyCallExpression: f
      PyReferenceExpression: f
        PsiElement(Py:IDENTIFIER)('f')
      PyArgumentList
        PsiElement(Py:LPAR)('(')
        PsiElement(Py:RPAR)(')')            