lookupTypeName does not support type operators not starting with :
The following non-working code (minus a missing import) was posted on stackoverflow:
IssueTH.hs:
{-# LANGUAGE TemplateHaskell #-}
module IssueTH where
import Language.Haskell.TH
f :: Q [Dec]
f = do
Just n <- lookupTypeName "GHC.TypeLits.*"
return []Issue.hs:
{-# LANGUAGE TemplateHaskell #-}
module Issue where
import IssueTH
import GHC.TypeLits
$fghc Issue.hs fails with message:
Pattern match failure in do expression at IssueTH.hs:7:5-10
This gives no error if * is replaced by an alphanumeric type like Nat. Similar tests seem to fail whenever attempting to look up a type operator with lookupTypeName.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.10.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Template Haskell |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | oerjan |
| Operating system | |
| Architecture |