class_docstr: Concrete class that implements an interface to Microsoft Visual C++,
  as defined by the CCompiler abstract class.
code: def out_extensions(self):
      return {
          **super().out_extensions,
          **{
              ext: self.res_extension
              for ext in self._rc_extensions + self._mc_extensions
          },
      }
  
imports: import os
  import subprocess
  import contextlib
  import warnings
  import unittest.mock
  from .errors import DistutilsExecError, DistutilsPlatformError, CompileError, LibError, LinkError
  from .ccompiler import CCompiler, gen_lib_options
  from ._log import log
  from .util import get_platform
  from itertools import count
label_desc: Use image node_id 5 for calling the MSVCCompiler obj's underlying member method code with example usage: obj.out_extensions() and returns: dict