#12096: Attach stacktrace information to SomeException -------------------------------------+------------------------------------- Reporter: ndtimofeev | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: Component: Core Libraries | Version: 8.0.1 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 ezyang): I don't think there is any way to attach a stack trace directly to the `SomeException` data type without breaking code that catches and rethrows exceptions of type `e` (with the constraint `Exception e`). So the not- very-nice conclusion is that we in fact *have* to embed the call stack in every exception type. This doesn't mean that `throw` can't also know how to attach call stacks: for example, the `Exception` type class could be extended with methods for getting and putting the call stack (and the exception instance can even make decisions like whether or not to keep all call stacks around, or just keep the first one, etc). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12096#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler