utils: Move combinators to (guix combinators).

* guix/utils.scm (compile-time-value, memoize, fold2)
(fold-tree, fold-tree-leaves): Move to...
* guix/combinators: ... here.  New file.
* tests/utils.scm ("fold2, 1 list", "fold2, 2 lists")
(fold-tree tests): Move to...
* tests/combinators.scm: ... here.  New file.
* Makefile.am (MODULES, SCM_TESTS): Add them.
* gnu/packages.scm, gnu/packages/bootstrap.scm,
gnu/services/herd.scm, guix/build-system/gnu.scm,
guix/build-system/python.scm, guix/derivations.scm,
guix/gnu-maintenance.scm, guix/import/elpa.scm,
guix/scripts/archive.scm, guix/scripts/build.scm,
guix/scripts/graph.scm, guix/scripts/lint.scm,
guix/scripts/size.scm, guix/scripts/substitute.scm,
guix/serialization.scm, guix/store.scm, guix/ui.scm: Adjust imports
accordingly.

1 files changed, 0 insertions, 56 deletions

diff --git a/tests/utils.scm b/tests/utils.scm
index 854999f670..a54482e94c 100644
--- a/tests/utils.scm
+++ b/tests/utils.scm
@@ -97,31 +97,6 @@
         (string-replace-substring "/nix/store/chbouib" "/nix/" "/gnu/")
         (string-replace-substring "" "foo" "bar")))
 
-(test-equal "fold2, 1 list"
-    (list (reverse (iota 5))
-          (map - (reverse (iota 5))))
-  (call-with-values
-      (lambda ()
-        (fold2 (lambda (i r1 r2)
-                 (values (cons i r1)
-                         (cons (- i) r2)))
-               '() '()
-               (iota 5)))
-    list))
-
-(test-equal "fold2, 2 lists"
-    (list (reverse '((a . 0) (b . 1) (c . 2) (d . 3)))
-          (reverse '((a . 0) (b . -1) (c . -2) (d . -3))))
-  (call-with-values
-      (lambda ()
-        (fold2 (lambda (k v r1 r2)
-                 (values (alist-cons k v r1)
-                         (alist-cons k (- v) r2)))
-               '() '()
-               '(a b c d)
-               '(0 1 2 3)))
-    list))
-
 (test-equal "strip-keyword-arguments"
   '(a #:b b #:c c)
   (strip-keyword-arguments '(#:foo #:bar #:baz)
@@ -136,37 +111,6 @@
         (ensure-keyword-arguments '(#:foo 2) '(#:bar 3))
         (ensure-keyword-arguments '(#:foo 2) '(#:bar 3 #:foo 42))))
 
-(let* ((tree (alist->vhash
-              '((0 2 3) (1 3 4) (2) (3 5 6) (4 6) (5) (6))
-              hashq))
-       (add-one (lambda (_ r) (1+ r)))
-       (tree-lookup (lambda (n) (cdr (vhash-assq n tree)))))
-  (test-equal "fold-tree, single root"
-    5 (fold-tree add-one 0 tree-lookup '(0)))
-  (test-equal "fold-tree, two roots"
-    7 (fold-tree add-one 0 tree-lookup '(0 1)))
-  (test-equal "fold-tree, sum"
-    16 (fold-tree + 0 tree-lookup '(0)))
-  (test-equal "fold-tree, internal"
-    18 (fold-tree + 0 tree-lookup '(3 4)))
-  (test-equal "fold-tree, cons"
-    '(1 3 4 5 6)
-    (sort (fold-tree cons '() tree-lookup '(1)) <))
-  (test-equal "fold-tree, overlapping paths"
-    '(1 3 4 5 6)
-    (sort (fold-tree cons '() tree-lookup '(1 4)) <))
-  (test-equal "fold-tree, cons, two roots"
-    '(0 2 3 4 5 6)
-    (sort (fold-tree cons '() tree-lookup '(0 4)) <))
-  (test-equal "fold-tree-leaves, single root"
-    2 (fold-tree-leaves add-one 0 tree-lookup '(1)))
-  (test-equal "fold-tree-leaves, single root, sum"
-    11 (fold-tree-leaves + 0 tree-lookup '(1)))
-  (test-equal "fold-tree-leaves, two roots"
-    3 (fold-tree-leaves add-one 0 tree-lookup '(0 1)))
-  (test-equal "fold-tree-leaves, two roots, sum"
-    13 (fold-tree-leaves + 0 tree-lookup '(0 1))))
-
 (test-assert "filtered-port, file"
   (let* ((file  (search-path %load-path "guix.scm"))
          (input (open-file file "r0b")))