https://git.ruby-lang.org/ruby.git/commit/?id=21600a5f64

From 21600a5f643d7edb3ce76e0257b92848ee86568e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 7 Jan 2021 16:35:35 +0900
Subject: Ensure that version number starts with digits

---
 internal/error.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/internal/error.h b/internal/error.h
index b1095b7..6fbe31b 100644
--- a/internal/error.h
+++ b/internal/error.h
@@ -75,6 +75,7 @@ PRINTF_ARGS(void rb_warn_deprecated_to_remove(const char *removal, const char *f https://github.com/ruby/ruby/blob/trunk/internal/error.h#L75
 RBIMPL_ATTR_FORCEINLINE()
 static void
 rb_deprecated_method_to_be_removed(const char *removal)
+    RBIMPL_ATTR_DIAGNOSE_IF(!RUBY_VERSION_isdigit(removal[0]), "malformed version number", "error")
     RBIMPL_ATTR_DIAGNOSE_IF(RUBY_VERSION_SINCE(removal), "deprecated method to be removed", "error")
 {
 }
@@ -82,7 +83,7 @@ rb_deprecated_method_to_be_removed(const char *removal) https://github.com/ruby/ruby/blob/trunk/internal/error.h#L83
 RBIMPL_ATTR_ERROR(("deprecated"))
 void rb_deprecated_method_to_be_removed(const char *);
 #   define rb_deprecated_method_to_be_removed(removal) \
-    (sizeof(char[1-2*RUBY_VERSION_SINCE(removal)])!=1 ? \
+    (sizeof(char[1-2*(!RUBY_VERSION_isdigit(removal[0]) || RUBY_VERSION_SINCE(removal))])!=1 ? \
      rb_deprecated_method_to_be_removed(removal) : \
      RBIMPL_ASSERT_NOTHING)
 # endif
-- 
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