New function keep: generalized keepqual.

* eval.c (eval_init): Register keep intrinsic.

* lib.[ch] (keep): New function.

* stdlib/compiler.tl (compiler comp-fun-form): Transform
two argument keep to keepqual.

* txr.1: Documented.

1 files changed, 1 insertions, 0 deletions

diff --git a/eval.c b/eval.c
index 11545a12..93576d00 100644
--- a/eval.c
+++ b/eval.c
@@ -7490,6 +7490,7 @@ void eval_init(void)
   reg_fun(intern(lit("keepqual"), user_package), func_n3o(keepqual, 2));
   reg_fun(intern(lit("keep-if"), user_package), func_n4o(keep_if, 2));
   reg_fun(intern(lit("keep-keys-if"), user_package), func_n4o(keep_keys_if, 2));
+  reg_fun(intern(lit("keep"), user_package), func_n5o(keep, 2));
   reg_fun(intern(lit("separate"), user_package), func_n3o(separate, 2));
   reg_fun(intern(lit("separate-keys"), user_package), func_n3o(separate_keys, 2));
   reg_fun(intern(lit("remq*"), user_package), func_n2(remq_lazy));