Scheme+ for DrRacket by Damien Mattei.
Install as a package with the package manager.
The documentation is here: https://github.com/damien-mattei/Scheme-PLUS-for-Racket/blob/gh-pages/README.md
Designed to use with SRFI 105 Curly Infix reader for Racket.
With Racket you do not need to define/declare a variable with the Scheme+ operator <+. Because the binding of the variable is autodetect you can simply set the variable with <- (or :=) and Scheme+ will do the job.
The Racket GUI can not display the line of error in a Scheme+ program. If you have to debug your source code you must generate a Scheme file from your Scheme+ file with curly-infix2prefix4racket and load the result file in Racket GUI. Then you will have all the debug information of Racket on the scheme file.Another solution is to simply copy/paste the pure Racket code generated by the SRFI 105 Curly Infix parser and run it like a normal Racket program. Again you will have all the information about errors with the true line number displayed.