Tuple (and other exotic predicates) not yet handled in Template Haskell
Say I make the following declarations:
{-# LANGUAGE ConstraintKinds #-}
type IOable a = (Show a, Read a)
foo :: IOable a => a
foo = undefined
It is currently impossible to reify
foo
in Template Haskell. This also comes up when using nested lists of constraints in Template Haskell quotes.
Trac metadata
Trac field | Value |
---|---|
Version | 7.5 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Template Haskell |
Test case | |
Differential revisions | |
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Blocking | |
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