Something is wrong with my build setup. I'm getting this error:
Error: The module List is an alias for module ListLabels, which is missing
In the interactive top-level ListLabels
exists, but not during compilation.
I tracked this error message to this line of code in the OCaml compiler:
https://github.com/ocaml/ocaml/blob/70d880a41a82aae1ebd428fd38100e8467f8535a/typing/typetexp.ml#L905
Turns out the reason is the following compiler flag: