On Sun, Feb 10, 2019 at 11:56 PM Bradley Lucier <lucier@math.purdue.edu> wrote:

“filter” is not part of the R4RS or R5RS scheme standards, which Gambit implements. It appears that Marc is rapidly adding routines to Gambit to make it R7RS compliant, but I don’t see a “filter” routine in R7RS-small.

“Filter” is implemented in SRFI-1, and there is port of SRFI-1 to Gambit in the “Dumping Grounds”:

Right. The only SRFI-1 procedures added to R7RS-small are `make-list` and `list-copy`, based on the corresponding vector and string procedures. In addition, some others were slightly changed for SRFI 1 compatibility: e.g. R7RS-small `map` is specified to stop when one of the list arguments is exhausted, whereas in R5RS it was an error to provide lists of different lengths.

John Cowan http://vrici.lojban.org/~cowan cowan@ccil.org

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