You want to use syntax/loc. The error message comes from the lambda,
not from the keyword argument. It could be possible to change where
lambda looks for the error srcloc, but if you don't want to do that,
you can just use syntax/loc in the right spot:
On Wed, Mar 8, 2017 at 1:28 PM, Dan Liebgold
> I have a syntax transformer that loses enough syntax context that it's error
> message points to the transformer rather than the usage. Here's an example of
> what it should do:
> This one gives correct syntax in the error message (not in pasterack, but in
> Dr Racket), but I have code that appears identical in all important ways that
> only gives context inside transformer.
> What could cause this usage to lose context?
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