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To: "Marty Leisner" <>
Subject: Re: flex limitations
In-reply-to: Your message of Sat, 06 Sep 1997 11:27:21 PDT.
Date: Mon, 08 Sep 1997 11:38:08 PDT
From: Vern Paxson <vern>

> %%
> [a-zA-Z]+       /* skip a line */
>                 {  printf("got %s\n", yytext); }
> %%

What version of flex are you using?  If I feed this to 2.5.4, it complains:

	"bug.l", line 5: EOF encountered inside an action
	"bug.l", line 5: unrecognized rule
	"bug.l", line 5: fatal parse error

Not the world's greatest error message, but it manages to flag the problem.

(With the introduction of start condition scopes, flex can't accommodate
an action on a separate line, since it's ambiguous with an indented rule.)

You can get 2.5.4 from