From ce99cfa1039d81a377f044f4a079b5b3e2b781bb Mon Sep 17 00:00:00 2001
From: Eman Resu <78693624+quatquatt@users.noreply.github.com>
Date: Tue, 26 May 2026 13:23:08 -0400
Subject: [PATCH] lib.types: remove assertMsg usage

assertMsg sends our error message through a function call, even if the
error condition doesn't trigger. This requires a lot of thunk allocation
that can be easily avoided.
---
 lib/types.nix | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/types.nix b/lib/types.nix
index f9ae3c82a172..41acfd907854 100644
--- a/lib/types.nix
+++ b/lib/types.nix
@@ -408,7 +408,7 @@ rec {
       betweenDesc = lowest: highest: "${toString lowest} and ${toString highest} (both inclusive)";
       between =
         lowest: highest:
-        assert lib.assertMsg (lowest <= highest) "ints.between: lowest must be smaller than highest";
+        assert lowest <= highest || throw "ints.between: lowest must be smaller than highest";
         addCheck int (x: x >= lowest && x <= highest)
         // {
           name = "intBetween";
@@ -495,7 +495,7 @@ rec {
     {
       between =
         lowest: highest:
-        assert lib.assertMsg (lowest <= highest) "numbers.between: lowest must be smaller than highest";
+        assert lowest <= highest || throw "numbers.between: lowest must be smaller than highest";
         addCheck number (x: x >= lowest && x <= highest)
         // {
           name = "numberBetween";
@@ -1728,9 +1728,9 @@ rec {
   # converted to `finalType` using `coerceFunc`.
   coercedTo =
     coercedType: coerceFunc: finalType:
-    assert lib.assertMsg (
+    assert
       coercedType.getSubModules == null
-    ) "coercedTo: coercedType must not have submodules (it’s a ${coercedType.description})";
+      || throw "coercedTo: coercedType must not have submodules (it’s a ${coercedType.description})";
     mkOptionType rec {
       name = "coercedTo";
       description = "${optionDescriptionPhrase (class: class == "noun") finalType} or ${