https://git.ruby-lang.org/ruby.git/commit/?id=edf01d4e82

From edf01d4e82d8e44ee30ec41fbcb7f802bc8b8c5d Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 17 Aug 2021 18:45:36 +0900
Subject: Treat NULL fake string as an empty string

And the NULL string must be of size 0.
---
 string.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/string.c b/string.c
index 8efe117..9727182 100644
--- a/string.c
+++ b/string.c
@@ -413,6 +413,11 @@ setup_fake_str(struct RString *fake_str, const char *name, long len, int encidx) https://github.com/ruby/ruby/blob/trunk/string.c#L413
     fake_str->basic.flags = T_STRING|RSTRING_NOEMBED|STR_NOFREE|STR_FAKESTR;
     /* SHARED to be allocated by the callback */
 
+    if (!name) {
+	RUBY_ASSERT_ALWAYS(len == 0);
+	name = "";
+    }
+
     ENCODING_SET_INLINED((VALUE)fake_str, encidx);
 
     RBASIC_SET_CLASS_RAW((VALUE)fake_str, rb_cString);
-- 
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