From 76d77908d6f599d9e65d2a3e7b5cdf29376a361b Mon Sep 17 00:00:00 2001
From: Philip Taron <philip.taron@gmail.com>
Date: Mon, 16 Feb 2026 06:31:29 -0800
Subject: [PATCH] sbclPackages.named-readtables: fix build with SBCL 2.6.0

SBCL commit 00eabf5 changed the readtable's base-char-macro-array to
store 0 instead of NIL for non-macro characters. Since (if 0 ...) is
truthy in Common Lisp, the named-readtables readtable iterator
incorrectly yields all characters, causing assertion failures in
check-reader-macro-conflict when packages like cl-interpol,
pythonic-string-reader, and antik-base merge readtables.

Apply upstream fix from melisgl/named-readtables@6eea566.
---
 pkgs/development/lisp-modules/ql.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/development/lisp-modules/ql.nix b/pkgs/development/lisp-modules/ql.nix
index 725a6353f983..ffa7c0d08aa4 100644
--- a/pkgs/development/lisp-modules/ql.nix
+++ b/pkgs/development/lisp-modules/ql.nix
@@ -12,6 +12,15 @@ let
 
   overrides = (
     self: super: {
+      named-readtables = super.named-readtables.overrideLispAttrs (o: {
+        patches = (o.patches or [ ]) ++ [
+          (pkgs.fetchpatch {
+            name = "named-readtables-sbcl-fix.patch";
+            url = "https://github.com/melisgl/named-readtables/commit/6eea56674442b884a4fee6ede4c8aad63541aa5b.patch";
+            hash = "sha256-ZkmBz50tkJutCNhrgVTHyE+sxRjmL8y7YC7yewrmves=";
+          })
+        ];
+      });
       cl_plus_ssl = super.cl_plus_ssl.overrideLispAttrs (o: {
         nativeLibs = [ pkgs.openssl ];
       });