#15360: Template Haskell splicing drops lots of type arguments -------------------------------------+------------------------------------- Reporter: goldfire | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Template | Version: 8.4.3 Haskell | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The conversion functions (in the `Convert` module) drop type arguments in various places. Here are two examples: {{{ data T a b c = Mk a b c bar :: $( return $ AppT (InfixT (ConT ''Int) ''T (ConT ''Bool)) (ConT ''Double) ) bar = Mk 5 True 3.14 }}} This correct code leads to an error {{{ Expecting one more argument to ‘T Int Bool’ }}} because the `Double` is forgotten. Similarly, {{{ baz :: $( return $ AppT (ParensT (ConT ''Maybe)) (ConT ''Int) ) baz = Just 5 }}} fails because `baz :: (Maybe)` isn't valid. On the other hand, {{{ frob :: forall (a :: $( [t| * Int |] )). a -> a frob x = x }}} is spuriously accepted, because GHC has forgotten about the `Int` argument. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15360 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler