anchor.diff:  :CLEAN
   for %%a in (
      olvm.js
  -   src\repl.c
  -   src\repl.o
  -   src\repl32.o
      test-ffi32.exe
      test-ffi64.exe
      test-vm32.exe
      test-vm64.exe
      tmp\repl.c
  +   tmp\repl.o
      tmp\repl32.o
      tmp\repl64.o
      tmp\slim.c
  
positive.code: GOTO:EOF
  
  :BOOT
  vm repl <tutorial/attic/to-c.scm >src/boot.c
  GOTO:EOF
  
  :: ======================================
  
negative.code: FOR %%I IN (repl) DO FOR %%J IN (boot.fasl) DO echo ":: %%~zI -> %%~zJ"
  fc /b repl boot.fasl > nul
  if errorlevel 1 goto again
  ld -r -b binary -o tmp/repl.o repl
  GOTO:EOF
  :again
  copy boot.fasl repl
  