Feature request: Ability to launch repl for a script with experimental import parser

[k-bx]

Right now, there's a wonderful script parser implemented as a part of #2805 which lets you write scripts like this:

#!/usr/bin/env stack
-- stack --resolver lts-8.12 script
import Control.Concurrent.Async.Lifted
import Control.Monad.State.Strict

main :: IO ()
main = execStateT
    (concurrently (modify (+ 1)) (modify (+ 2)))
    4 >>= print

It would be super-nice to be able to also easily launch a REPL, which parses imports and loads the file.

[kadoban]

I would definitely use that.

How should it work though? Would you just run stack ghci TheFile.hs ? That already mostly works of course, the difference would be that it would pass on the --resolver and --package arguments I suppose?

And it seems like maybe it should then ignore any otherwise-applicable stack.yaml files?

Should it also imply the -hide-all-packages stuff that stack script implies?

Edit: I initially missed the import parser behavior, sorry. I see what's being requested now.

[mgsloan]

Should be a pretty straightforward change to Stack.Ghci! PRs appreciated!