-- Bar.hs starts as a broken file
00:15:02 - tora@eustacia:/tmp
>cat Bar.hs 
module Bar where

bar = 

00:15:04 - tora@eustacia:/tmp
>ghci Bar.hs 
GHCi, version 6.8.2: http://www.haskell.org/ghc/  :? for help
Loading package base ... linking ... done.
[1 of 1] Compiling Bar              ( Bar.hs, interpreted )

Bar.hs:4:0: parse error (possibly incorrect indentation)
Failed, modules loaded: none.
Prelude> :e                                             -- Bar is now OK
Prelude> :r
[1 of 1] Compiling Bar              ( Bar.hs, interpreted )
Ok, modules loaded: Bar.
Prelude> :m +Bar                                        *****************
Prelude Bar> :e                                         -- Bar is now BAD
Prelude Bar> :r
[1 of 1] Compiling Bar              ( Bar.hs, interpreted )

Bar.hs:4:0: parse error (possibly incorrect indentation)
Failed, modules loaded: none.
Prelude> :e                                             -- Bar is now OK
Prelude> :r
[1 of 1] Compiling Bar              ( Bar.hs, interpreted )
Ok, modules loaded: Bar.
Prelude Bar> :l Bar
[1 of 1] Compiling Bar              ( Bar.hs, interpreted )
Ok, modules loaded: Bar.
*Bar> :e                                                -- Bar is now BAD
*Bar> :r
[1 of 1] Compiling Bar              ( Bar.hs, interpreted )

Bar.hs:4:0: parse error (possibly incorrect indentation)
Failed, modules loaded: none.
Prelude> :e                                             -- Bar is now OK
Prelude> :r
[1 of 1] Compiling Bar              ( Bar.hs, interpreted )
Ok, modules loaded: Bar.
*Bar> :e                                                -- Bar is now BAD
*Bar> :l Bar  
[1 of 1] Compiling Bar              ( Bar.hs, interpreted )

Bar.hs:4:0: parse error (possibly incorrect indentation)
Failed, modules loaded: none.
Prelude> :e                                             -- Bar is now OK
Prelude> :r                                             
[1 of 1] Compiling Bar              ( Bar.hs, interpreted )
Ok, modules loaded: Bar.
Prelude> Leaving GHCi.                                  ****************