PyFile:FloorDiv.py
  PyAugAssignmentStatement
    PyReferenceExpression: a
      PsiElement(Py:IDENTIFIER)('a')
    PsiWhiteSpace(' ')
    PsiElement(Py:FLOORDIVEQ)('//=')
    PsiWhiteSpace(' ')
    PyNumericLiteralExpression
      PsiElement(Py:INTEGER_LITERAL)('2')