FunctionTypeComment:a.functionTypeComment
  PyFunctionTypeAnnotation
    PyParameterTypeList
      PsiElement(Py:LPAR)('(')
      PyLambdaExpression
        PsiElement(Py:LAMBDA_KEYWORD)('lambda')
        PyParameterList
          <empty list>
        PsiElement(Py:COLON)(':')
        PsiWhiteSpace(' ')
        PyNumericLiteralExpression
          PsiElement(Py:INTEGER_LITERAL)('42')
      PsiErrorElement:')' expected
        <empty list>