Prohibit assignment to numbered parameters.

It is stricter than CRuby but confusing anyway.

Prohibit assignment to numbered parameters.
It is stricter than CRuby but confusing anyway.
d15e56da · Yukihiro "Matz" Matsumoto · ff163317 · d15e56da
Commit d15e56da authored Dec 26, 2019 by Yukihiro "Matz" Matsumoto
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mrbgems/mruby-compiler/core/parse.y mrbgems/mruby-compiler/core/parse.y +8 -0

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--- 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