#10913: deprecate and then remove -fwarn-hi-shadowing -------------------------------------+------------------------------------- Reporter: osa1 | Owner: ChrisU Type: task | Status: new Priority: lowest | Milestone: Component: Compiler | Version: 7.10.2 Resolution: | Keywords: newcomer Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): -------------------------------------+------------------------------------- Comment (by ChrisU): This maybe shouldn't be deprecated as we can actually get a situation where such a warning would be useful. Its a bit pathological in nature, which might be why this has been left nonworking for 15 years. {{{ ~/test$ ghc --make Test -ia -ib -fforce-recomp -fwarn-hi-shadowing [1 of 2] Compiling B ( a/B.hs, a/B.o ) [2 of 2] Compiling Main ( Test.hs, Test.o ) Linking Test ... ~/test$ find . . ./b ./b/B.hi ./b/B.hs ./b/B.o ./Test.hi ./Test.hs ./Test ./Test.o ./a ./a/B.hi ./a/B.hs ./a/B.o ~/test$ ./Test a ~/test$ cat b/B.hs module B where main' = putStrLn "b" ~/test$ cat a/B.hs module B where main' = putStrLn "a" }}} A warning that b/B.hi is getting ignored would be useful. On the other hand if this turned up too often, we would have gotten complaints/requests over the last 15 years. (It was removed between 4.02 and 5.0, presumably because hierarchical modules made shadowed .hi files much rarer and harder to test for.) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10913#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler