Suggest correct spelling when module is not found because of typo

Given these two modules:

Aaa.hs:

module Aaa where

import           BBb

main :: IO ()
main = putStrLn myString

Bbb.hs:

module Bbb where

myString :: String
myString = "hi"

There's a typo in Aaa.hs, the import should be Bbb instead of BBb.

Running runhaskell Aaa.hs results in this error:

Aaa.hs:3:18:
    Could not find module ‘BBb’
    Use -v to see a list of the files searched for.

The request is to have the compiler suggest that this is a typo and that it should be Bbb instead. It already does this for misspelled functions, if I recall correctly.

Because the compiler will not continue when finding an error like this, it won't be harmful to spend a little extra time looking for possible misspellings.

How typo's should be recognized is something that should be fleshed out later. For example, a hamming distance of 2 or less could indicate a typo.

I'd like to pick this one up and try to implement it as my first patch to GHC.