Re: [GHC] #14323: Occurs check regressions in GHC 8.2.1 (and HEAD)

#14323: Occurs check regressions in GHC 8.2.1 (and HEAD) -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.2.1 checker) | 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 simonpj): comment:8 done in {{{ commit f20cf982f126aea968ed6a482551550ffb6650cf Author: Simon Peyton Jones Date: Mon Oct 9 13:16:59 2017 +0100 Remove wc_insol from WantedConstraints This patch is a pure refactoring, which I've wanted to do for some time. The main payload is * Remove the wc_insol field from WantedConstraints; instead put all the insolubles in wc_simple * Remove inert_insols from InertCans Instead put all the insolubles in inert_irreds * Add a cc_insol flag to CIrredCan, to record that the constraint is definitely insoluble Reasons * Quite a bit of code gets slightly simpler * Fewer concepts to keep separate * Insolubles don't happen at all in production code that is just being recompiled, so previously there was a lot of moving-about of empty sets A couple of error messages acutally improved. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14323#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler