overlay: add back patch :P

overlays/452438.diff

@@ -0,0 +1,70 @@
+From df5d4d3daab7e022335c0f3304d7b750bdd731a0 Mon Sep 17 00:00:00 2001
+From: Russ Cox <rsc@golang.org>
+Date: Tue, 15 Nov 2022 09:54:39 -0500
+Subject: [PATCH] [release-branch.go1.19] sync/atomic: allow linked list of atomic pointers again
+
+For #56603, CL 448275 added a _ [0]T field to atomic.Pointer,
+so that different kinds of atomic.Pointer are not convertible.
+
+Unfortunately, that breaks code like:
+
+	type List struct {
+		Next atomic.Pointer[List]
+	}
+
+which should be valid, just as using Next *List is valid.
+Instead, we get:
+
+	./atomic_test.go:2533:6: invalid recursive type List
+		./atomic_test.go:2533:6: List refers to
+		./atomic_test.go:2534:13: "sync/atomic".Pointer refers to
+		./atomic_test.go:2533:6: List
+
+Fix by using _[0]*T instead.
+
+For #56638.
+Fixes #57124.
+
+Change-Id: Icc4c83c691d35961d20cb14b824223d6c779ac5e
+Reviewed-on: https://go-review.googlesource.com/c/go/+/450655
+Run-TryBot: Russ Cox <rsc@golang.org>
+TryBot-Result: Gopher Robot <gobot@golang.org>
+Reviewed-by: Michael Knyszek <mknyszek@google.com>
+(cherry picked from commit b14cf3d93ae5c477dd35f13f6ba41044f01a7f7d)
+Reviewed-on: https://go-review.googlesource.com/c/go/+/452438
+Reviewed-by: Cherry Mui <cherryyz@google.com>
+Run-TryBot: Michael Pratt <mpratt@google.com>
+Reviewed-by: Michael Pratt <mpratt@google.com>
+---
+
+diff --git a/src/sync/atomic/atomic_test.go b/src/sync/atomic/atomic_test.go
+index 02d55fb..3ab5e83 100644
+--- a/src/sync/atomic/atomic_test.go
++++ b/src/sync/atomic/atomic_test.go
+@@ -2605,3 +2605,9 @@
+ 		}()
+ 	}
+ }
++
++// Test that this compiles.
++// When atomic.Pointer used _ [0]T, it did not.
++type List struct {
++	Next Pointer[List]
++}
+diff --git a/src/sync/atomic/type.go b/src/sync/atomic/type.go
+index 2d1e621..93058ca 100644
+--- a/src/sync/atomic/type.go
++++ b/src/sync/atomic/type.go
+@@ -37,9 +37,10 @@
+ 
+ // A Pointer is an atomic pointer of type *T. The zero value is a nil *T.
+ type Pointer[T any] struct {
+-	// Mention T in a field to disallow conversion between Pointer types.
++	// Mention *T in a field to disallow conversion between Pointer types.
+ 	// See go.dev/issue/56603 for more details.
+-	_ [0]T
++	// Use *T, not T, to avoid spurious recursive type definition errors.
++	_ [0]*T
+ 
+ 	_ noCopy
+ 	v unsafe.Pointer

overlays/default.nix

@@ -21,6 +21,7 @@ let
   };
 in {
   nixpkgs.overlays = if isUnstable then [
+    tailscale
     (self: super: {
       rex = super.rex.overrideAttrs (old: {
         patches = [