PyFile:NotClosedBraceSet.py
  PyAssignmentStatement
    PyTargetExpression: a
      PsiElement(Py:IDENTIFIER)('a')
    PsiWhiteSpace(' ')
    PsiElement(Py:EQ)('=')
    PsiWhiteSpace(' ')
    PySetLiteralExpression
      PsiElement(Py:LBRACE)('{')
      PyStringLiteralExpression: b
        PsiElement(Py:SINGLE_QUOTED_STRING)(''b'')
      PsiElement(Py:COMMA)(',')
      PsiErrorElement:'}' expected
        <empty list>
  PsiElement(Py:RBRACKET)(']')
  PsiErrorElement:Statement expected, found Py:RBRACKET
    <empty list>