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| author | Kaz Kylheku <kaz@kylheku.com> | 2019-09-10 20:00:16 -0700 |
|---|---|---|
| committer | Kaz Kylheku <kaz@kylheku.com> | 2019-09-10 20:00:16 -0700 |
| commit | 7c68bc3f17cd3d595241d5dc42d27e8cc8a90c59 (patch) | |
| tree | fc8fbccd2efa397c52998b23a81cd0d252c0523e | |
| parent | a0d944cea8724e45be522536ce75b650320be479 (diff) | |
| download | txr-7c68bc3f17cd3d595241d5dc42d27e8cc8a90c59.tar.gz txr-7c68bc3f17cd3d595241d5dc42d27e8cc8a90c59.tar.bz2 txr-7c68bc3f17cd3d595241d5dc42d27e8cc8a90c59.zip | |
list-builder: simplify circularity check in pend.
* share/txr/stdlib/build.tl (list-builder pend): Use tailp
instead of last and eq.
| -rw-r--r-- | share/txr/stdlib/build.tl | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/share/txr/stdlib/build.tl b/share/txr/stdlib/build.tl index c607571f..76be9f55 100644 --- a/share/txr/stdlib/build.tl +++ b/share/txr/stdlib/build.tl @@ -49,10 +49,7 @@ (let ((st self.tail)) (rplacd st (append (cdr st) nil))) (let* ((tl (last self.tail)) - (cp (let ((ll (car (last lists)))) - (if (consp ll) - (let ((lt (last ll))) - (eq tl lt))))) + (cp (tailp tl (car (last lists)))) (nl [apply append lists])) (usr:rplacd tl (append (cdr tl) (if cp (copy-list nl) nl))) (set self.tail tl)) |