PyFile:YieldFromNoExpr.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(' ')
          PsiElement(Py:FROM_KEYWORD)('from')
          PsiErrorElement:Expression expected
            <empty list>