#14626: No need to enter a scrutinised value -------------------------------------+------------------------------------- Reporter: heisenbug | Owner: heisenbug Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Resolution: | Keywords: performance Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #13861 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by alexbiehl): I think I know what is happening: - When generating code for `f` the CodeGenerator wants to know the `LambdaFormInfo` (the closure type) of `defaultUserStyle1`. - Since `defaultUserStyle1` is defined in another module we end up calling `mkLFImported` in `StgCmmClosure` which ultimatively gives an `LFUnknown` which always gets a `DynTag` 0 from `lfDynTag`. I think we lack a bit of information here to give `defaultUserStyle1` the correct `LFCon` lambda form. Maybe top-level binders should know its LambdaForm and include them in their interfaces. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14626#comment:38 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler