#13253: Exponential compilation time with RWST & ReaderT stack with `-02` -------------------------------------+------------------------------------- Reporter: phadej | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 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: -------------------------------------+------------------------------------- See the attached file. The compilation time grows exponentially with additional fields in `HuteStruct`. Tried with GHC-8.0.1 and quite recent HEAD (8.2) adding a field doubles the compilation time with `-O2`. - 9: 17s - 10: 34s - 11: 83s on my machine. With `-01` around 3sec, independently of the struct size. The original issue: https://github.com/yesodweb/yesod/issues/1348 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13253 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler