This one may need careful review, though I am pretty confident the refactors
are sound.

1 patch for repository http://darcs.net/screened:

patch 71465505ff2739ec188389590751f0d82ade6dc1
Author: Ben Franksen <ben.franksen@online.de>
Date:   Fri Aug  2 19:06:48 CEST 2019
  * turn an error call into a proper failure when cloning
  
  This patch also cleans up the surrounding code:
   * find uncommon patches only once instead of twice
   * replace repeated calls to lengthFL with a let-bound variable
   * rename some variables
   * remove unneeded calls to hopefully and effect
  Regarding the last change, note that (apply . effect) is strictly inferior
  to the plain apply, since the latter is hopefully optimized via applyPrimFL.

Attachments

• patch-preview.txt
• turn-an-error-call-into-a-proper-failure-when-cloning.dpatch
• unnamed

Looks good