[racket] syntax-parse #:at

Ok I see from the syntax/parse source that it uses lctx as the first argument to datum->syntax, so that mostly answers my question.

On 05/17/2012 02:41 PM, Jon Rafkind wrote:
> What exactly are the semantics of #:at inside a #:literal-sets ([x #:at y]) ?
>
> From the docs " If the #:at keyword is given, the lexical context of the lctx term is used to determine which identifiers in the patterns are treated as literals;". In what way is 'lctx' used?
>
>
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