Dynamically set -hide-all-packages is being ignored.

Consider the following two alternative ways of specifying dynflags:

./inplace/bin/ghc-stage2 --interactive -hide-all-packages -package base
GHCi, version 7.1.20101013: http://www.haskell.org/ghc/  :? for help
[...]
Prelude> import Control.Monad.State.Strict

<no location info>:
    Could not find module `Control.Monad.State.Strict':
      It is a member of the hidden package `monads-fd-0.1.0.2'.
      It is a member of the hidden package `mtl-1.1.1.0'.
      Use -v to see a list of the files searched for.

Now, instead of specifying the flags on startup we set them after startup:

./inplace/bin/ghc-stage2 --interactive
GHCi, version 7.1.20101013: http://www.haskell.org/ghc/  :? for help
[...]
Prelude> import Control.Monad.State.Strict

<no location info>:
    Ambiguous module name `Control.Monad.State.Strict':
      it was found in multiple packages: monads-fd-0.1.0.2 mtl-1.1.1.0
Prelude> :set -hide-all-packages
Prelude> import Control.Monad.State.Strict

<no location info>:
    Ambiguous module name `Control.Monad.State.Strict':
      it was found in multiple packages: monads-fd-0.1.0.2 mtl-1.1.1.0

The interactive call to :set -hide-all-packages is ignored. The same happens inside the GHC API (which is causing me problems).

You need to have both mtl and monads-fd installed to get the above error.

Trac metadata

Trac field	Value
Version	6.13
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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