[racket] online check syntax error display tweak

From: Grant Rettke (grettke at acm.org)
Date: Fri Sep 9 12:16:47 EDT 2011

On Fri, Sep 9, 2011 at 11:05 AM, Vincent St-Amour <stamourv at ccs.neu.edu> wrote:
> What about horizontal lines before and after the relevant line,
> running across the whole editor. Finding the relevant code becomes a
> matter of following the lines. Grant Rettke's IntelliJ screenshot does
> something similar, and I think it helps.

I've got "method separator's" enabled.

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