Revert "Try removing the bytecomp-revert.patch"

This reverts commit d6772c6.

overlays/bytecomp-revert.patch

@@ -0,0 +1,30 @@
+diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
+index 6c5051d70c4..a0063cbef7b 100644
+--- a/lisp/emacs-lisp/bytecomp.el
++++ b/lisp/emacs-lisp/bytecomp.el
+@@ -3570,8 +3570,6 @@ byte-compile-form
+                 (setq form (cons 'progn (cdr form)))
+                 (setq handler #'byte-compile-progn))
+                ((and (or sef (function-get (car form) 'important-return-value))
+-                     ;; Don't warn for arguments to `ignore'.
+-                     (not (eq byte-compile--for-effect 'for-effect-no-warn))
+                      (byte-compile-warning-enabled-p
+                       'ignored-return-value (car form)))
+                 (byte-compile-warn-x
+@@ -4515,8 +4513,11 @@ byte-compile-goto-if
+
+ (defun byte-compile-ignore (form)
+   (dolist (arg (cdr form))
+-    ;; Compile each argument for-effect but suppress unused-value warnings.
+-    (byte-compile-form arg 'for-effect-no-warn))
++    ;; Compile args for value (to avoid warnings about unused values),
++    ;; emit a discard after each, and trust the LAP peephole optimiser
++    ;; to annihilate useless ops.
++    (byte-compile-form arg)
++    (byte-compile-discard))
+   (byte-compile-form nil))
+
+ ;; Return the list of items in CONDITION-PARAM that match PRED-LIST.
+-- 
+2.42.0
+

overlays/emacs.nix

@@ -92,12 +92,24 @@ let
                   # TODO: remove when we drop support for < 23.05, and instead move withTreeSitter to the above line with the other arguments
                   maybeOverridden = if (super.lib.hasAttr "treeSitter" base || super.lib.hasAttr "withTreeSitter" base) then base.override { withTreeSitter = true; } else base;
               in
-                maybeOverridden;
+                maybeOverridden.overrideAttrs (
+                  oa: {
+                    patches = oa.patches ++ [
+                      # XXX: #318
+                      ./bytecomp-revert.patch
+                    ]; }
+                );
 
   emacs-pgtk = let base = super.lib.makeOverridable (mkGitEmacs "emacs-pgtk" ../repos/emacs/emacs-master.json) { withSQLite3 = true; withWebP = true; withPgtk = true; };
                    # TODO: remove when we drop support for < 23.05, and instead move withTreeSitter to the above line with the other arguments
                    maybeOverridden = if (super.lib.hasAttr "treeSitter" base || super.lib.hasAttr "withTreeSitter" base) then base.override { withTreeSitter = true; } else base;
-               in maybeOverridden;
+               in maybeOverridden.overrideAttrs (
+                 oa: {
+                   patches = oa.patches ++ [
+                     # XXX: #318
+                     ./bytecomp-revert.patch
+                   ]; }
+               );
 
   emacs-unstable = let base = super.lib.makeOverridable (mkGitEmacs "emacs-unstable" ../repos/emacs/emacs-unstable.json) { withSQLite3 = true; withWebP = true; };
                        # TODO: remove when we drop support for < 23.05, and instead move withTreeSitter to the above line with the other arguments