I get error:
f := () => u := 1(due to assignment), I can do
(u := 1)though.
I make unspecfic title if others have general comments or questions, we do not need many threads.
Although I like the name. fat arrow, I'd prefer something easier to type, eg
f := () :: expr, fat colon? (Sorry if I'm the kid complaining about getting a blue ferrari instead of a red)
I do not know how you type
=>on english keyboard, but on mine, I do
shift + <for