anchor.diff:  @echo off & setlocal enableextensions enabledelayedexpansion
   ::
  -:: t-all.bat - perform tests with varying contract violation response,
  -::             span index type and C++ standard (MSVC).
  +:: t-all.bat - perform tests with varying contract violation response, features, span index type and C++ standard (MSVC).
   ::
   
   set log=%0.log
  
positive.code: :ForAllCombinations
  :ForContractViolationResponse
  for %%r in ( %cvResponses% ) do (
      call :ForSpanIndexType -D%%r
  )
  goto :EOF
  
  
negative.code: 
  :CompileLog  contractViolationResponse spanIndexSize [CppStd]
  echo VC%compiler_version%: %*
  call :Compile %* >> %log%  2>&1
  if errorlevel 1 (
      less %log% & goto :EOF
  ) else (
  