Reason: Proper error when using unit in function type declaration

[iddan]

I am relatively new to ReasonML, but coming from a rich FlowType background. I tried to do:

type a = () => string;

And received the cryptic error message in try Reason:

<syntax error>

And a proper syntax error message in Merlin (which was not useful as well)
I turned to the docs and discovered I should have done:

type a = unit => string;

[jaredly]

Yeahhh. imo it would be great to have the parser just accept () as an alias for unit in the type position