https://git.ruby-lang.org/ruby.git/commit/?id=0036648a42

From 0036648a420f945624898568bb82bc5f83195d12 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 13 Jan 2021 21:15:13 +0900
Subject: Capture to reserved name variables if already defined [Bug #17533]


diff --git a/parse.y b/parse.y
index cdd64f7..538153c 100644
--- a/parse.y
+++ b/parse.y
@@ -12811,12 +12811,13 @@ reg_named_capture_assign_iter(const OnigUChar *name, const OnigUChar *name_end, https://github.com/ruby/ruby/blob/trunk/parse.y#L12811
     NODE *node, *succ;
 
     if (!len) return ST_CONTINUE;
-    if (len < MAX_WORD_LENGTH && rb_reserved_word(s, (int)len))
-        return ST_CONTINUE;
     if (rb_enc_symname_type(s, len, enc, (1U<<ID_LOCAL)) != ID_LOCAL)
         return ST_CONTINUE;
 
     var = intern_cstr(s, len, enc);
+    if (len < MAX_WORD_LENGTH && rb_reserved_word(s, (int)len)) {
+	if (!lvar_defined(p, var)) return ST_CONTINUE;
+    }
     node = node_assign(p, assignable(p, var, 0, arg->loc), NEW_LIT(ID2SYM(var), arg->loc), NO_LEX_CTXT, arg->loc);
     succ = arg->succ_block;
     if (!succ) succ = NEW_BEGIN(0, arg->loc);
diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index 194b8c3..495c9de 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -229,6 +229,17 @@ class TestRegexp < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_regexp.rb#L229
   def test_assign_named_capture_to_reserved_word
     /(?<nil>.)/ =~ "a"
     assert_not_include(local_variables, :nil, "[ruby-dev:32675]")
+
+    def (obj = Object.new).test(s, nil: :ng)
+      /(?<nil>.)/ =~ s
+      binding.local_variable_get(:nil)
+    end
+    assert_equal("b", obj.test("b"))
+
+    tap do |nil: :ng|
+      /(?<nil>.)/ =~ "c"
+      assert_equal("c", binding.local_variable_get(:nil))
+    end
   end
 
   def test_assign_named_capture_to_const
-- 
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