#14218: GHC.Stack.HasCallStack not compatible with constraint synonyms -------------------------------------+------------------------------------- Reporter: ntc2 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 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 bgamari):
Ben's explanation sounds plausible to me, though I didn't realize constraint synonyms worked this way.
I actually didn't realize it either until I looked at the tc-trace output. I also don't know whether there is a good reason (other than efficiency) why they *must* be implemented this way. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14218#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler