From d15e56dab03f2295dd1d9ecc2e22c6f0ce53e0e3 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Thu, 26 Dec 2019 19:27:14 +0900
Subject: Prohibit assignment to numbered parameters.

It is stricter than CRuby but confusing anyway.
---
 mrbgems/mruby-compiler/core/parse.y | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'mrbgems/mruby-compiler')

diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index 45c6229da..f8db486a5 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -1952,6 +1952,10 @@ lhs             : variable
                       backref_error(p, $1);
                       $$ = 0;
                     }
+                | tNUMPARAM
+                    {
+                      yyerror(p, "can't assign to numbered parameter");
+                    }
                 ;
 
 cname           : tIDENTIFIER
@@ -3275,6 +3279,10 @@ var_lhs         : variable
                     {
                       assignable(p, $1);
                     }
+                | tNUMPARAM
+                    {
+                      yyerror(p, "can't assign to numbered parameter");
+                    }
                 ;
 
 var_ref         : variable
-- 
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