https://git.ruby-lang.org/ruby.git/commit/?id=7c22898a3a

From 7c22898a3a5a10c8c71683918b53ec2d17fdc621 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 12 Nov 2019 15:42:53 +0900
Subject: Disable tOROP at EXPR_BEG

Both cannot appear there anyway.

diff --git a/parse.y b/parse.y
index dd55279..0bda2d2 100644
--- a/parse.y
+++ b/parse.y
@@ -3453,15 +3453,6 @@ block_param_def	: '|' opt_bv_decl '|' https://github.com/ruby/ruby/blob/trunk/parse.y#L3453
 		    /*% %*/
 		    /*% ripper: block_var!(params!(Qnil,Qnil,Qnil,Qnil,Qnil,Qnil,Qnil), escape_Qundef($2)) %*/
 		    }
-		| tOROP
-		    {
-			p->cur_arg = 0;
-			p->max_numparam = ORDINAL_PARAM;
-		    /*%%%*/
-			$$ = 0;
-		    /*% %*/
-		    /*% ripper: block_var!(params!(Qnil,Qnil,Qnil,Qnil,Qnil,Qnil,Qnil), Qnil) %*/
-		    }
 		| '|' block_param opt_bv_decl '|'
 		    {
 			p->cur_arg = 0;
@@ -9164,6 +9155,11 @@ parser_yylex(struct parser_params *p) https://github.com/ruby/ruby/blob/trunk/parse.y#L9155
 		return tOP_ASGN;
 	    }
 	    pushback(p, c);
+	    if (IS_lex_state_for(last_state, EXPR_BEG)) {
+		c = '|';
+		pushback(p, '|');
+		return c;
+	    }
 	    return tOROP;
 	}
 	if (c == '=') {
-- 
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