lib: remove alias `lib.warn`

docs/release-notes/rl-0.7.md

@@ -19,6 +19,8 @@ Release notes for release 0.7
 [horriblename](https://github.com/horriblename):
 
 - Fix broken treesitter-context keybinds in visual mode
+- Depcrecate use of `__empty` to define empty tables in lua. Empty attrset are
+  no longer filtered and thus should be used instead.
 
 [NotAShelf](https://github.com/notashelf)
 

lib/lua.nix

@@ -3,7 +3,7 @@
   inherit (builtins) hasAttr head throw typeOf isList isAttrs isBool isInt isString isPath isFloat toJSON;
   inherit (lib.attrsets) mapAttrsToList filterAttrs;
   inherit (lib.strings) concatStringsSep concatMapStringsSep stringToCharacters;
-  inherit (lib.trivial) boolToString;
+  inherit (lib.trivial) boolToString warn;
 in rec {
   wrapLuaConfig = {
     luaBefore ? "",
@@ -65,6 +65,11 @@ in rec {
     then
       if isLuaInline args
       then args.expr
+      else if hasAttr "__empty" args
+      then
+        warn ''
+          Using `__empty` to define an empty lua table is deprecated. Use an empty attrset instead.
+        '' "{ }"
       else
         "{"
         + (concatStringsSep ","