wanted: reusing freshly consed lists

Bug #408866 reported by Nikodemus Siivola
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
SBCL
Confirmed
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Bug Description

  (MAPCAR F (MAPCAR G LIST))

could be transformed into

  (MAPCAR-DESTRUCTIVE F (MAPCAR G LIST))

and similarly NREVERSE could be automatically substituted when the argument is know to be freshly consed.

Tags: optimization
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