https://git.ruby-lang.org/ruby.git/commit/?id=71c166e11e

From 71c166e11e761dcaaa943f9b94da38f86ada1bdb Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 15 May 2020 12:50:02 +0900
Subject: Fixed argument forwarding in reserved word method [Bug #16854]


diff --git a/parse.y b/parse.y
index 6b378b0..0ac4304 100644
--- a/parse.y
+++ b/parse.y
@@ -2152,10 +2152,6 @@ fname		: tIDENTIFIER https://github.com/ruby/ruby/blob/trunk/parse.y#L2152
 			$$ = $1;
 		    }
 		| reswords
-		    {
-			SET_LEX_STATE(EXPR_ENDFN);
-			$$ = $1;
-		    }
 		;
 
 fitem		: fname
@@ -8834,11 +8830,12 @@ parse_ident(struct parser_params *p, int c, int cmd_state) https://github.com/ruby/ruby/blob/trunk/parse.y#L8830
 	kw = rb_reserved_word(tok(p), toklen(p));
 	if (kw) {
 	    enum lex_state_e state = p->lex.state;
-	    SET_LEX_STATE(kw->state);
 	    if (IS_lex_state_for(state, EXPR_FNAME)) {
+		SET_LEX_STATE(EXPR_ENDFN);
 		set_yylval_name(rb_intern2(tok(p), toklen(p)));
 		return kw->id[0];
 	    }
+	    SET_LEX_STATE(kw->state);
 	    if (IS_lex_state(EXPR_BEG)) {
 		p->command_start = TRUE;
 	    }
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 23061e3..d419fc8 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -1503,6 +1503,11 @@ eom https://github.com/ruby/ruby/blob/trunk/test/ruby/test_syntax.rb#L1503
   def test_argument_forwarding
     assert_valid_syntax('def foo(...) bar(...) end')
     assert_valid_syntax('def foo(...) end')
+    assert_valid_syntax('def ==(...) end')
+    assert_valid_syntax('def [](...) end')
+    assert_valid_syntax('def nil(...) end')
+    assert_valid_syntax('def true(...) end')
+    assert_valid_syntax('def false(...) end')
     assert_syntax_error('iter do |...| end', /unexpected/)
     assert_syntax_error('iter {|...|}', /unexpected/)
     assert_syntax_error('->... {}', /unexpected/)
-- 
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