Are solutions to the exercises available?

I hope not!

Well specifically, it would be helpful (at least for beginners like me!) to review the code for the past exercises we went over in lecture.

I’m hardline on this. Work out your answers and get someone else to comment on them.

does anyone remember how to have one collection define multiple languages? e.g. #lang simple #lang simple/lang1 #lang simple/lang2

I apparently incorrectly assumed that I needed to just drop main.rkt that defines relevant (module reader ...) into each subdirectory and than run in terminal e.g. raco link simple or appropriate raco pkg install simple/, but I keep getting

; standard-module-name-resolver: collection not found
;   for module path: simple/syntax-param/lang/reader
;   collection: "simple/syntax-param/lang"
;   in collection directories:

I can work around this by painstaikingly installing everyone of those languages as a separate collection, but I really want to be able to just #lang simple/lang1

not urgent, but could anyone pls teach me tomorrow

You can have lang1.rkt, lang2.rkt within the simple directory.

(See first paragraph of section 7.1 in the lecture notes.)

damn it, it totally worked. Thanks @plragde