[racket] thread-through ?

From: Don Green (infodeveloperdon at gmail.com)
Date: Fri Feb 20 18:56:14 EST 2015

I looked in racket documentation and discussion archives for a
thread-through function as illustrated below but without success.
Any suggestions where I should look? OR please explain that line below only.
Looks like it is declaring thread-safe variables x e and any others I care
to list.  Is that correct?

;Use a macro:
(thread-through x e …)
(let* ([x e] …) x)
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