From 7e6355975eff730c1fefc414fbf7c9d0bacbef01 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 21 Dec 2019 23:03:08 +0900
Subject: Prohibit numbered parameters as method arguments; fix #4892

As of CRuby2.7 it is only warned. `mruby` prohibits explicitly to
implement the future Ruby3 behavior.
---
 mrbgems/mruby-compiler/core/parse.y | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index de875a1ae..ddf420d17 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -3538,6 +3538,11 @@ f_bad_arg       : tCONSTANT
                       yyerror(p, "formal argument cannot be a class variable");
                       $$ = 0;
                     }
+                | tNUMPARAM
+                    {
+                      yyerror(p, "formal argument cannot be a numbered parameter");
+                      $$ = 0;
+                    }
                 ;
 
 f_norm_arg      : f_bad_arg
@@ -5969,9 +5974,6 @@ parser_yylex(parser_state *p)
             nvars->cdr = nint(-1);
             nvars = nvars->car;
           }
-          if (intn(p->nvars->cdr) < 0) {
-            yywarning(p, "numbered parameter in nested block");
-          }
           pylval.num = n;
           p->lstate = EXPR_END;
           return tNUMPARAM;
-- 
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