#15304: Huge increase of compile time and memory use from 8.0.2 to 8.2.2 or 8.4.2 -------------------------------------+------------------------------------- Reporter: NathanWaivio | Owner: tdammers Type: bug | Status: new Priority: high | Milestone: 8.6.1 Component: Compiler | Version: 8.4.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: x86_64 Type of failure: Compile-time | (amd64) performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by tdammers): It seems that the `Eq` instance is at the core of the problem: replacing it with the following allows GHC to compile the module in a timely fashion, and compilation succeeds even with a heap limit of only 128M: {{{#!haskell instance Eq Cl3 where (==) = undefined }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15304#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler