[muuh-gnu]

> Racket, arguably the most popular Scheme implementation

Umm, NO. Racket isnt a "Scheme implementation". Racket was a Scheme as long as they called themselves MzScheme. Then they decided that they changed too much that a complete name change was justified in order to not confuse users.

Racket isnt a "Scheme implementation" for the same reason Scheme isnt a "Lisp implementation".

[elibarzilay]

From http://racket-lang.org/new-name.html -- "Racket is a Scheme". The name change was about very different things than "basic scheme routines", and it would be hard to find any basic scheme implementation without any.

[iopq]

Scheme is a "Lisp implementation", it's just not a "Common Lisp implementation"