@meowy: Yes, this especially happens with aggressive-indent-mode or similar. If you want a comment on a line of its own you can use two semicolons. If you use one semicolon, it treats/interprets it as like an inline comment for the end of a line

(this is originally a scheme (maybe common lisp?) convention as I understand it)

Ah, neat. I'll use two semicolons from now on, then.

I think Cursive doesn’t do this (at least by default) so it is a minor source of confusion on projects where folks use either

bbatsov's Clojure style guideline recommends such, too.

ah cool. good to know

https://github.com/bbatsov/clojure-style-guide#two-semicolons-for-code-fragment