Template Haskell conversion fails with "malformed type"
Nicholas Frisby writes: When using Template Taskell (via Derive) to generate this (exact) instance:
instance Foldable ((->) Int) => Foldable Data.Derivable.InterpreterLib.Test.List
where foldMap f (Cons x0 x1) = (const mempty Cons `mappend` foldMap f x0)
`mappend` foldMap f x1
foldMap f (Nil) = const mempty Nil
I realize the context is unsatisfiable. My issue, is that I can't even reach that "challenge". I get this error instead:
Malformed type AppT ArrowT (ConT GHC.Base.Int)
When splicing generated code into the program
Trac metadata
Trac field | Value |
---|---|
Version | 6.10.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | nicolas.frisby@gmail.com |
Operating system | |
Architecture |