PVS-Studio warning V509 for protobuf

CommandLineInterface::MemoryOutputStream::~MemoryOutputStream()
{
  ....
  *map_slot = new string;
  ....
}

This suspicious code was found in protobuf project by PVS-Studio static code analyzer.
Warning message is:
V509 The 'new' operator should be located inside the try..catch block, as it could potentially generate an exception. Raising exception inside the destructor is illegal. command_line_interface.cc 479

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