#15043: Expand type synonym -------------------------------------+------------------------------------- Reporter: domenkozar | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler (Type | Version: 8.2.2 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 osa1): RyanGlScott, your analysis is correct, this is by design. It's impossible to provide one flag that'll make everyone happy, because expanding _all_ synonyms (as noted in the note quoted in comment:5) often results in huge types that are impossible to compare -- that's why we choose to expand until the difference becomes apparent. So perhaps we can provide another flag for expanding _all_ synonyms when needed (although I'm not sure if that'd result in reasonably-sized types in this case -- servant's types are quite complex!) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15043#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler