Minor parser enhancement request: Not recognizing empty tuple / mistyped unit literal

[dxrcy]

When using empty parens as a unit literal () (as in Rust) instead of the correct {}, the parser rightly gives an error, but does not explain why it is wrong.

main =
    Inspect.toStr ()
        |> Stdout.line!

── SYNTAX PROBLEM in main.roc ──────────────────────────────────────────────────

I got stuck here:

[...]
4│
5│  main =
6│      Inspect.toStr ()
                     ^

Whatever I am running into is confusing me a lot! Normally I can give
fairly specific hints, but something is really tripping me up this
time.

I believe including a hint or explanation would be beneficial, like the existing Note, Roc doesn't use '()' as a null type. when using () in a type declaration.

Perhaps something like:

• Roc doesn't use parentheses for function calls
• Did you mean to use {} instead?
• Did you forget to include an expression in the parentheses?

[Anton-4]

Good suggestions @dxrcy, we could make it this:

Tip: Roc doesn't use parentheses for function calls:
    - Did you mean to use `{}` instead?
    - Did you forget to include an expression in the `()`?