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And if you mix both every language that relies on indentation (Python e.g.) throws you a nice warning or even an error.

• Shorel 13y ago
  The only exception I can think for the 'use tabs' rule in languages without Lisp syntax is precisely Python. Therefore, to me, your 'every language' reduces to a list of one.
  • swift 13y ago
    Indentation is also significant in Haskell, for example.