build failures when hiding non-visible imports

[Simon Peyton-Jones]

| Would it be reasonable to change ghc's behavior to treat this 
| (ie an 'import' statement that hides something that isn't exported) as a
| warning instead of an error?

Yes, that would be easy if it's what everyone wants. Any other opinions?

Simon


| -----Original Message-----
| From: glasgow-haskell-users-bounces at haskell.org [mailto:glasgow-
| haskell-users-bounces at haskell.org] On Behalf Of John Lato
| Sent: 17 August 2012 02:13
| To: glasgow-haskell-users at haskell.org
| Subject: build failures when hiding non-visible imports
| 
| Hello,
| 
| One of the issues I've noticed with ghc-7.6 is that a number of
| packages fail due to problematic import statements.  For example, any
| module which uses
| 
| > import Prelude hiding (catch)
| 
| now fails to build with the error
| 
|     Module `Prelude' does not export `catch'
| 
| Of course fixing this example is relatively straightforward, but that
| isn't always the case.
| 
| Would it be reasonable to change ghc's behavior to treat this as a
| warning instead of an error?
| 
| Cheers,
| John L.
| 
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