p.s. there is a related discussion on the developers group though including 
macros.  (It was there that Robby suggsted the > raccket -l errortrace -t file).

On Monday, November 9, 2015 at 1:35:23 AM UTC, Nota Poin wrote:
> I'll have code like this:
> 
> #lang racket/base
> 
> (define (baz foo)
>   (error 'whoops))
> 
> (define (bar ber)
>   (baz ber))
> 
> (define (foo ber)
>   (let ((a 3))
>       (if (and
>                (= a 3)
>                (= (* a 9) 27)
>                (bar ber)
>                (list? (list 1 2 3 4)))
>               ber
>               (not ber))))
> 
> (foo 42)
> 
> And I get an error message like this:
> 
> error: whoops
>   context...:
>    /extra/user/code/racket-stack.rkt: [running body]
> 
> That doesn't show the line number on which the error occurred, or even the 
> location of the expression being evaluated. For a custom error, I could just 
> grep through the code for "whoops", but for say an error like "string-append: 
> contract violation" I may have many uses of string-append, and I might not be 
> able to debug them if I can't tell what context they're being being evaluated 
> in.
> 
> How do I enable uh, "working" stack traces? --no-jit just removes stack 
> traces entirely. -W debug says the functions are being inlined, but doesn't 
> debug info for the inlining specify what function was inlined? racket has no 
> debug flag that I can find. Setting --disable-inline in raco and running the 
> bytecode produces no information in the stack trace either.
> 
> Sometimes (unpredictably AFAIK) I do get /some/ line information, but it's at 
> most the function that the error happened in, not the error itself which 
> could be anywhere inside it or any inlined function.
> 
> $ racket -V 
> Welcome to Racket v6.2.1.
> 
> Please tell me I'm not gonna have to say Guido was right...

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