#10895: "no output will be generated" should be an error, not a warning. -------------------------------------+------------------------------------- Reporter: gershomb | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Incorrect Unknown/Multiple | warning at compile-time Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -------------------------------------+------------------------------------- Consider a file "Test.hs" which has a "main" function but is declared as "module Test where..." If we attempt to compile it, we get the following warning: {{{ Warning: output was redirected with -o, but no output will be generated because there is no Main module. }}} This should be upgraded from a warning to an error. This would help e.g. Cabal, because such warnings do not lead to a failure of the wrapping Cabal process, which is confusing to end-users. For gory details, see e.g. discussion at https://github.com/haskell/cabal/issues/1847 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10895 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler