I find that 99% of the time when I'm using syntax parameters, I'm just using 
them with make-rename-transformer to implement macro-dependent keyword-like 
things, such as `aif` and `it`. So I made a small helper macro 
syntax-parameterize-rename:

(syntax-parameterize-rename ([param #'foo]) ...)

expands to

(syntax-parameterize ([param (make-rename-transformer #'foo)]) ...)

It seems weird to put it in a package when it's so heavily tied to the core 
syntax-parameterize form. I've added it to my fork of the Racket repo. Would 
anyone else find this useful enough to warrant a pull request? The code is at 
https://github.com/jackfirth/racket/tree/stx-param-rename

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