Template Haskell drops singleton unboxed tuples
The following module compiles with Ghc HEAD, but shouldn't:
{-# LANGUAGE TemplateHaskell, UnboxedTuples #-}
module Tuple where
import Language.Haskell.TH
f :: Int
f = $( [| (# 0 #) |] )In hsSyn/Convert.lhs, we can see why this is happening; we have a handful of lines like this:
...
cvt (UnboxedTupE [e]) = cvt e -- Singleton tuples treated like nothing (just parens)
...This is correct for boxed tuples, but not for unboxed tuples.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Template Haskell |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |