src/doc/style/features/loops.md

   1 % Loops
   2
   3 ### Prefer `for` to `while`. [FIXME: needs RFC]
   4
   5 A `for` loop is preferable to a `while` loop, unless the loop counts in a
   6 non-uniform way (making it difficult to express using `for`).
   7
   8 ### Guidelines for `loop`. [FIXME]
   9
  10 > **[FIXME]** When is `loop` recommended? Some possibilities:
  11 > * For optimistic retry algorithms
  12 > * For servers
  13 > * To avoid mutating local variables sometimes needed to fit `while`