bug#31996: 27.0.50; [w32] while dumping: assertion failed: specpdl_ptr->kind == SPECPDL_UNWIND_PTR && specpdl_ptr->unwind_ptr.func == xfree

[Paul Eggert <eggert@cs.ucla.edu>]

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Eli Zaretskii wrote:
>   maybe a comment explaining why the order might matter in general
> could be of more value, and require less maintenance.

I gave that a shot by installing the attached.

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From 9ffc9ec7a70c2e971b616146cb49b084981b74a9 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Fri, 29 Jun 2018 00:29:13 -0700
Subject: [PATCH] * src/lisp.h: Add comment (Bug#31996#25).

---
 src/lisp.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/lisp.h b/src/lisp.h
index cf7b8c0..6203a74 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -3050,6 +3050,8 @@ enum specbind_tag {
 
 union specbinding
   {
+    /* Aligning similar members consistently might help efficiency slightly
+       (Bug#31996#25).  */
     ENUM_BF (specbind_tag) kind : CHAR_BIT;
     struct {
       ENUM_BF (specbind_tag) kind : CHAR_BIT;
-- 
2.7.4