Compilation error: Ambiguous occurrence 'try'

[MichaelBaker]

I get the following compilation error on OSX using haskell-platform 2012.4.0.0 from Homebrew.

HSH/Command.hs:497:13:
    Ambiguous occurrence `try'
    It could refer to either `System.IO.Error.try',
                             imported from `System.IO.Error' at HSH/Command.hs:42:1-37
                          or `Control.Exception.try',
                             imported from `Control.Exception' at HSH/Command.hs:46:26-28
                             (and originally defined in `Control.Exception.Base')

[ierton]

Is it an HSH issue? Can you install HSH alone with 'cabal install HSH' ?

[MichaelBaker]

Yep, it fails in isolation too.

[ierton]

I've check HSH. Error you have reported exists in 2.0.3 and 2.0.4 . HSH-2.1.0 works fine on my machine. Can you try 2.1.0?

[MichaelBaker]

That one doesn't seem to work for me either. There's an open pull request for HSH that fixes this problem, but it's been open for two months :/

Resolving dependencies...
Configuring HSH-2.1.0...
Building HSH-2.1.0...
Preprocessing library HSH-2.1.0...
[1 of 4] Compiling HSH.Channel      ( HSH/Channel.hs, dist/build/HSH/Channel.o )

HSH/Channel.hs:61:42:
    Warning: This binding for `h' shadows the existing binding
               bound at HSH/Channel.hs:59:22

HSH/Channel.hs:62:39:
    Warning: This binding for `h' shadows the existing binding
               bound at HSH/Channel.hs:59:22
[2 of 4] Compiling HSH.Command      ( HSH/Command.hs, dist/build/HSH/Command.o )

HSH/Command.hs:497:13:
    Ambiguous occurrence `try'
    It could refer to either `System.IO.Error.try',
                             imported from `System.IO.Error' at HSH/Command.hs:42:1-37
                          or `Control.Exception.try',
                             imported from `Control.Exception' at HSH/Command.hs:46:26-28
                             (and originally defined in `Control.Exception.Base')
Failed to install HSH-2.1.0
cabal: Error: some packages failed to install:
HSH-2.1.0 failed during the building phase. The exception was:
ExitFailure 1