#12689: DataCon wrappers get in the way of rules -------------------------------------+------------------------------------- Reporter: nomeata | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by nomeata): I just found this comment in `SimplUtils`: {{{ active_unfolding_minimal :: Id -> Bool -- Compuslory unfoldings only -- Ignore SimplGently, because we want to inline regardless; -- the Id has no top-level binding at all -- -- NB: we used to have a second exception, for data con wrappers. -- On the grounds that we use gentle mode for rule LHSs, and -- they match better when data con wrappers are inlined. -- But that only really applies to the trivial wrappers (like (:)), -- and they are now constructed as Compulsory unfoldings (in MkId) -- so they'll happen anyway. active_unfolding_minimal id = isCompulsoryUnfolding (realIdUnfolding id) }}} Was there a time when `(:)` had a wrapper? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12689#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler