Template Haskell silently boxes tuples
Here is a small program:
{-# LANGUAGE TemplateHaskell, UnboxedTuples #-}
module T where
$(id [d| f g x = case g x of (# _, _ #) -> x |])
Output of ghci -ddump-splices
:
f g[aR4] x[aR5] = case g[aR4] x[aR5] of { (_, _) -> x[aR5] }
Note how the tuple has been silently converted to a boxed one. TH shouldn't accept this program since it can't deal with unboxed tuples.
Trac metadata
Trac field | Value |
---|---|
Version | 6.10.4 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Template Haskell |
Test case | |
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Blocking | |
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