diff --git a/arrays.scad b/arrays.scad
index eea3ffe..aa3f9a2 100644
--- a/arrays.scad
+++ b/arrays.scad
@@ -848,7 +848,7 @@ function zip(vecs, v2, v3, fit=false, fill=undef) =
 	(v3!=undef)? zip([vecs,v2,v3], fit=fit, fill=fill) :
 	(v2!=undef)? zip([vecs,v2], fit=fit, fill=fill) :
 	let(
-		dummy1 = assert_in_list("fit", fit, [false, "short", "long"]),
+		dummy1 = assert(in_list(fit, [false, "short", "long"])),
 		minlen = list_shortest(vecs),
 		maxlen = list_longest(vecs),
 		dummy2 = (fit==false)? assert(minlen==maxlen, "Input vectors must have the same length") : 0
diff --git a/beziers.scad b/beziers.scad
index 7ec9fe9..a105e3a 100644
--- a/beziers.scad
+++ b/beziers.scad
@@ -379,7 +379,7 @@ function bezier_close_to_axis(bezier, N=3, axis="X") =
 		[for (i=[1:1:N]) lerp(ep, [0,ep.y], i/N)],
 		[for (i=[1:1:N]) lerp([0,ep.y], [0,sp.y], i/N)]
 	) : (
-		assert_in_list("axis", axis, ["X","Y"])
+		assert(in_list(axis, ["X","Y"]))
 	);
 
 
diff --git a/errors.scad b/errors.scad
index 0836271..4a3e009 100644
--- a/errors.scad
+++ b/errors.scad
@@ -12,34 +12,6 @@
 // Section: Warnings and Errors
 
 
-// Function&Module: assert_in_list()
-// Usage:
-//   assert_in_list(argname, val, l, [idx]);
-// Description:
-//   Emulates the newer OpenSCAD `assert()` with an `in_list()` test.
-//   You can also use this as a function call from a function.
-// Arguments:
-//   argname = The name of the argument value being tested.
-//   val = The value to test if it exists in the list.
-//   l = The list to look for `val` in.
-//   idx = If given, and `l` is a list of lists, look for `val` in the given index of each sublist.
-module assert_in_list(argname, val, l, idx=undef) {
-	dummy = assert_in_list(argname, val, l, idx);
-}
-
-function assert_in_list(argname, val, l, idx=undef) =
-	let(succ = search([val], l, num_returns_per_match=1, index_col_num=idx) != [[]])
-	succ? 0 : let(
-		msg = str(
-			"In argument '", argname, "', ",
-			(is_string(val)? str("\"", val, "\"") : val),
-			" must be one of ",
-			(!is_undef(idx)? [for (v=l) v[idx]] : l)
-		),
-		FAILED=succ
-	) assert(FAILED, msg);
-
-
 // Module: no_children()
 // Usage:
 //   no_children($children);
diff --git a/partitions.scad b/partitions.scad
index 65552a5..ef3c4fd 100644
--- a/partitions.scad
+++ b/partitions.scad
@@ -35,7 +35,7 @@ function _partition_cutpath(l, h, cutsize, cutpath, gap) =
 		cutpath = is_path(cutpath)? cutpath : (
 			assert(is_string(cutpath), "cutpath must be a 2D path or a string.")
 			let(idx = search([cutpath], _partition_cutpaths))
-			idx==[[]]? assert_in_list("cutpath",cutpath,_partition_cutpaths,idx=0) :
+			idx==[[]]? assert(in_list(cutpath,_partition_cutpaths,idx=0)) :
 			_partition_cutpaths[idx.x][1]
 		),
 		reps = ceil(l/(cutsize.x+gap)),
diff --git a/transforms.scad b/transforms.scad
index 9023339..e81cdf6 100644
--- a/transforms.scad
+++ b/transforms.scad
@@ -1209,7 +1209,7 @@ module zdistribute(spacing=10, sizes=undef, l=undef)
 //   }
 module grid2d(size=undef, spacing=undef, cols=undef, rows=undef, stagger=false, scale=[1,1,1], in_poly=undef, anchor=CENTER, spin=0, orient=UP)
 {
-	assert_in_list("stagger", stagger, [false, true, "alt"]);
+	assert(in_list(stagger, [false, true, "alt"]));
 	scl = vmul(scalar_vec3(scale, 1), (stagger!=false? [0.5, sin(60), 1] : [1,1,1]));
 	if (!is_undef(size)) {
 		siz = scalar_vec3(size);