From 412e3c7a8db275567eaceece6c48dde3aedf2ae6 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 19 Oct 2022 18:45:26 +0900
Subject: Assert for RTEST that Qnil and Qfalse differ just 1 bit

---
 include/ruby/internal/special_consts.h | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'include/ruby')

diff --git a/include/ruby/internal/special_consts.h b/include/ruby/internal/special_consts.h
index 38934e4da3..70276278eb 100644
--- a/include/ruby/internal/special_consts.h
+++ b/include/ruby/internal/special_consts.h
@@ -136,6 +136,7 @@ static inline bool
 RB_TEST(VALUE obj)
 {
     /*
+     * if USE_FLONUM
      *  Qfalse:  ....0000 0000
      *  Qnil:    ....0000 1000
      * ~Qnil:    ....1111 0111
@@ -143,6 +144,14 @@ RB_TEST(VALUE obj)
      * ----------------------------
      *  RTEST(v) ....xxxx 0xxx
      *
+     * if ! USE_FLONUM
+     *  Qfalse:  ....0000 0000
+     *  Qnil:    ....0000 0100
+     * ~Qnil:    ....1111 1011
+     *  v        ....xxxx xxxx
+     * ----------------------------
+     *  RTEST(v) ....xxxx x0xx
+     *
      *  RTEST(v) can be 0 if and only if (v == Qfalse || v == Qnil).
      */
     return obj & ~RUBY_Qnil;
-- 
cgit v1.2.3