Follow mtl upstream
As per http://projects.haskell.org/pipermail/haskell-platform/2012-March/001760.html we should be tracking https://github.com/ekmett/mtl.git (which may mean asking upstream to merge our patches, if we have any) and will also need to track http://code.haskell.org/~ross/transformers
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| Trac field | Value |
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| Version | 7.4.1 |
| Type | Task |
| TypeOfFailure | OtherFailure |
| Priority | high |
| Resolution | Unresolved |
| Component | Build System |
| Test case | |
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