#15702: "-main-is" flag is broken for recent ghc-head -------------------------------------+------------------------------------- Reporter: terrorjack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.6.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Incorrect | (amd64) error/warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by cdsmith): Arguably, I think this should never have worked in the first place. Here, Main.hs is relying on the default header to export `main` because of its name, even though `main` is no longer the entry point for this program. Adding an explicit export would fix it. If this was done in existing code, though, this does mean there's a backward-compatibility problem for that patch. That's unfortunate. The error message is also weird. There's a special error message for the `main` case that says something like "The IO action main is not defined in module Main", but `-main-is` seems to disable it and fall back to a generic "Not in scope". (This was pre-existing behavior, though. It's not new in GHC head.) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15702#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler