#3626: Template Haskell silently boxes tuples
-----------------------------+----------------------------------------------
Reporter: rl | Owner:
Type: bug | Status: new
Priority: normal | Component: Template Haskell
Version: 6.10.4 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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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.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3626>
GHC <http://www.haskell.org/ghc/>
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