Template haskell instance declaration quotations with members don't work in ghci
Inside GHCi, the following quotation fails:
Prelude Language.Haskell.TH> runQ [d| instance Monad ((,) a) where return = (,) undefined; (a,x) >>= f = f x |]
<interactive>:1:38:
`return' is not a (visible) method of class `Monad'
<interactive>:1:68:
`>>=' is not a (visible) method of class `Monad'
The same error seems to occur for any typeclass I try. This code works fine inside a module passed to GHC.
Trac metadata
Trac field | Value |
---|---|
Version | 6.12.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | GHCi |
Test case | |
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Blocking | |
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