#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 mnislaih): I reached the same conclusion, we have to embed call stacks in every exception type. But I don't think this is incompatible with adding them at the SomeException level. We cannot touch SomeException without breaking all the existing Exception instances, so we introduce a new primitive ancestor SomeExceptionWithCallStack in the hierarchy: {{{ SomeExceptionWithCallStack ^ ^ | | | | SomeException IOError }}} {{{ data SomeExceptionWithCallStack = SomeExceptionWithCallStack Exception [CallStack] data IOError = IOError { ... callStack : [CallStack], ...} class ExceptionWithCallStack e where toExceptionWithCallStack :: e -> SomeExceptionWithCallStack fromExceptionWithCallStack :: SomeExceptionWithCallStack -> Maybe e instance ExceptionWithCallStack SomeException ... instance ExceptionWithCallStack IOError ... }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12096#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler