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Comment by vgrichina | Hacker News Reader

Rule is straightforward – if there is stuff one indentation level deeper, prepend parens.

That doesn't explain the third line. Your rule would result in

    (if condition
      (1)
      (else-clause))

trying to call 1 as a function, which is an error.

No, there is nothing one indentation level deeper than 1, so it should have no parens according to the rule.

Ah, your wording was ambiguous. I thought you meant, in this situation:

    ...
      X
        Y
    ...

since Y is one indentation level deeper than X, prepend parens to Y. But you meant "since there exists Y such that Y is one indentation level deeper than X, prepend parens to X".

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