#13253: Exponential compilation time with RWST & ReaderT stack with `-02` -------------------------------------+------------------------------------- Reporter: phadej | Owner: dfeuer Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by mpickering): Adding an extra field leads to {{{ 8714 UnfoldingDone 8201 $c<*>_a4Ng }}} So each extra field leads to double the number of `<*>`s being inlined and hence the exponential behaviour. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13253#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler