From 5cc595cb2a057deff4c123425c9384f8e59e5e34 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 21 Dec 2019 01:21:52 +0900
Subject: Fix SEGV from numbered parameters outside of blocks; fix #4862

---
 mrbgems/mruby-compiler/core/parse.y | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index cf5f5230f..50bd01ba2 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -5952,7 +5952,7 @@ parser_yylex(parser_state *p)
       break;
 
     case '_':
-      if (toklen(p) == 2 && ISDIGIT(tok(p)[1])) {
+      if (toklen(p) == 2 && ISDIGIT(tok(p)[1]) && p->nvars) {
         int n = tok(p)[1] - '0';
         node *nvars = p->nvars->car;
 
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