[racket] syntax-parse #:at

From: Jon Rafkind (rafkind at cs.utah.edu)
Date: Thu May 17 16:41:06 EDT 2012

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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