GHCi erroneously unloads modules after a failed :reload

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Say you have three modules:

module Main where

import Foo
import Bar

module Foo where

module Bar where

And you run the following in GHCi:

:load Main
:! echo '"' >> Bar.hs # alter Bar in such a way that it fails to compile
:reload

What I expect to have happened is that Bar fails to compile and so does Main (because Main imports Bar), thus Bar and Main should get unloaded. So in the end Foo should be the only module left loaded.

What I've observed is that not only do Bar and Main get unloaded, but Foo does too! Yet Foo should not get unloaded because it has been altered.

Trac metadata

Trac field	Value
Version	7.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
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