From 27e57aad0beb6b8ed3797f867d5f76da7fc942bb Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 25 Dec 2021 23:05:42 +0900
Subject: parse.y: prohibit numbered parameters as arguments; fix #5605

---
 mrbgems/mruby-compiler/core/parse.y | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

(limited to 'mrbgems/mruby-compiler/core/parse.y')

diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index 2a8d3a060..de905e33f 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -2751,6 +2751,7 @@ primary         : literal
                 | tLAMBDA
                     {
                       local_nest(p);
+                      nvars_nest(p);
                       $<num>$ = p->lpar_beg;
                       p->lpar_beg = ++p->paren_nest;
                     }
@@ -2764,6 +2765,7 @@ primary         : literal
                       p->lpar_beg = $<num>2;
                       $$ = new_lambda(p, $3, $5);
                       local_unnest(p);
+                      nvars_unnest(p);
                       p->cmdarg_stack = $<stack>4;
                       CMDARG_LEXPOP();
                     }
@@ -6426,14 +6428,9 @@ parser_yylex(parser_state *p)
           if (nvar == -1) {
             yywarning(p, "numbered parameter used in inner block");
           }
-          if (nvar >= -1) {
-            pylval.num = n;
-            p->lstate = EXPR_END;
-            return tNUMPARAM;
-          }
-          else {
-            yywarning(p, "identifier for numbered parameter; consider another name");
-          }
+          pylval.num = n;
+          p->lstate = EXPR_END;
+          return tNUMPARAM;
         }
       }
       /* fall through */
-- 
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