This is racket's [rhombus], which might be an interesting second link here; it's a scheme, underneath, with the full power of Racket libs available.
[`shrubbery`], the replacement for s-exprs, is pretty interesting, expanding s-expr simply with grouping, and then a separate infix-pass on top. I've been playing with using it as the basis for a separate language; it's in an interesting place in the AST space, especially given the forethought put into macros.
A while back I had made my own alternative to s-exprs that works with Racket. I have no idea if it still works, but I still think it looks nice, and at a glance I feel it's "purer" than shrubbery: http://breuleux.net/blog/liso.html
I really wish they had kept the old C-like Honu syntax rather that the Python-like Shrubbery. If Rhombus is supposed to be an educational language, copy-pasting and trying out new code is going to be a important part of ecosystem, and indentation based syntax is not ideal for that.
I guess. Truth be told I've taught hundreds, bordering on thousands of undergraduate intro courses in python, and students mostly figure it out after they configure tabs and spaces.
There is a long history of identifying the problems and risks of copy-pasting, and trying to reduce it. I remember it was a selling point of Java in the early days. For all the efforts it doesn't seem to be going away. (all the boilerplate in Java probably didn't help)
C-parsing is still built-in [0], so whilst I don't think the standard library has a C-language, it's either really simple, or there'll be a few on the package manager.
[`shrubbery`], the replacement for s-exprs, is pretty interesting, expanding s-expr simply with grouping, and then a separate infix-pass on top. I've been playing with using it as the basis for a separate language; it's in an interesting place in the AST space, especially given the forethought put into macros.
[rhombus]: https://docs.racket-lang.org/rhombus/index.html
[shrubbery]: https://docs.racket-lang.org/shrubbery/index.html