From: Tanaka Akira <akr@...17n.org>
Date: 2005-09-02T17:53:52+09:00
Subject: [ruby-dev:26948] Re: core dump with ripper

In article <TYOMLEM051XvpFVjCRG00000028@tyomlvem02.e2k.ad.ge.com>,
  nobuyoshi nakada <nobuyoshi.nakada@ge.com> writes:

> Index: parse.y
> ===================================================================
> RCS file: /cvs/ruby/src/ruby/parse.y,v
> retrieving revision 1.407
> diff -U2 -p -u -r1.407 parse.y
> --- parse.y	30 Aug 2005 04:27:40 -0000	1.407
> +++ parse.y	2 Sep 2005 07:26:21 -0000
> @@ -4096,13 +4096,23 @@ f_norm_arg	: tCONSTANT
>  f_arg		: f_norm_arg
>  		    {
> -		        $$ = rb_ary_new3(1, ID2SYM($1));
> +		    /*%%%*/
> +			VALUE arg = ID2SYM($1);
> +		    /*%
> +			VALUE arg = $1;
> +		    %*/
> +		        $$ = rb_ary_new3(1, arg);
>  		    }
>  		| f_arg ',' f_norm_arg
>  		    {
> +		    /*%%%*/
> +			VALUE arg = ID2SYM($3);
> +		    /*%
> +			VALUE arg = $3;
> +		    %*/
>  			$$ = $1;
> -			if (rb_ary_includes($$, ID2SYM($3))) {
> -			    yyerror("duplicated argument name");
> +			if (rb_ary_includes($$, arg)) {
> +			    yyerror("duplicated argument arg");
>  			}
> -			rb_ary_push($$, ID2SYM($3));
> +			rb_ary_push($$, arg);
>  		    }
>  		;

適用して次のように動かすと途中で duplicated argument arg と出てきます
がそういうものでしょうか?

% ./ruby -v -rripper -e '
class C < Ripper
 PARSER_EVENTS.each {|n| eval "def on_#{n}(*args) r = [:#{n}, *args]; p r; nil end" }
 SCANNER_EVENTS.each {|n| eval "def on_#{n}(*args) r = [:#{n}, *args]; p r; nil end" }
end
C.new("def m(a, b) end").parse'
ruby 1.9.0 (2005-09-01) [i686-linux]
/tmp/r/lib/ruby/1.9/ripper/core.rb:391: warning: method redefined; discarding old on_do_block
[:kw, "def"]
[:sp, " "]
[:ident, "m"]
[:lparen, "("]
[:ident, "a"]
[:comma, ","]
[:sp, " "]
[:ident, "b"]
[:rparen, ")"]
[:parse_error, "duplicated argument arg"]
[:params, [nil, nil], nil, nil, nil]
[:paren, nil]
[:sp, " "]
[:kw, "end"]
[:void_stmt]
[:stmts_new]
[:stmts_add, nil, nil]
[:bodystmt, nil, nil, nil, nil]
[:def, nil, nil, nil]
[:stmts_new]
[:stmts_add, nil, nil]
[:program, nil]
-- 
[田中 哲][たなか あきら][Tanaka Akira]