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1 point by lojic 5408 days ago | link | parent

Some info from: http://docs.plt-scheme.org/release-notes/mzscheme/MzScheme_4...

  Indeed, our experience is that making the result of `cons' immutable
  does not create many porting problems. Nevertheless, if your code does
  use `set-car!' or `set-cdr!', and if converting to a more functional
  style is difficult, then consider using `mcons' and the `scheme/mpair'
  library.