#15052: DeriveAnyClass instances may skip TypeError constraints -------------------------------------+------------------------------------- Reporter: jcpetruzza | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.2.2 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 RyanGlScott): Right—that's because what you've written isn't equivalent to what `deriving C` will give you. `deriving C` gives you: {{{#!hs instance TypeError ('Text "BOOM") => C T }}} So I'm quite unclear on what the "bug" is here. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15052#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler