def run_as(self, identifiers):
if (not self.has_identifiers):<EOL><INDENT>msg = ("<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>")<EOL>raise ValueError(msg)<EOL><DEDENT>self.push_identity(identifiers)<EOL>
:type identifiers:  subject_abcs.IdentifierCollection