#10021: Add "Error:" prefix for error-messages -------------------------------------+------------------------------------- Reporter: k-bx | Owner: Type: feature request | Status: new Priority: normal | Milestone: 7.12.1 Component: Compiler | Version: 7.8.4 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Description changed by k-bx: Old description:
Similar to what we have for "Warning:".
E.g., we have:
{{{ ➜ cat test.hs main = putStrLn "Hello!" ➜ ghc --make -fforce-recomp -Wall ./test.hs [1 of 1] Compiling Main ( test.hs, test.o )
test.hs:1:1: Warning: Top-level binding with no type signature: main :: IO () Linking test ... ➜ cat test2.hs main = foo ➜ ghc --make -fforce-recomp -Wall ./test2.hs [1 of 1] Compiling Main ( test2.hs, test2.o )
test2.hs:1:8: Not in scope: ‘foo’ }}}
And I propose having:
{{{ ➜ cat test2.hs main = foo ➜ ghc --make -fforce-recomp -Wall ./test2.hs [1 of 1] Compiling Main ( test2.hs, test2.o )
test2.hs:1:8: Error: Not in scope: ‘foo’ }}}
New description: Similar to what we have for "Warning:". E.g., we have: {{{ ➜ cat test.hs main = putStrLn "Hello!" ➜ ghc --make -fforce-recomp -Wall ./test.hs [1 of 1] Compiling Main ( test.hs, test.o ) test.hs:1:1: Warning: Top-level binding with no type signature: main :: IO () Linking test ... ➜ cat test2.hs main = foo ➜ ghc --make -fforce-recomp -Wall ./test2.hs [1 of 1] Compiling Main ( test2.hs, test2.o ) test2.hs:1:8: Not in scope: ‘foo’ }}} And I propose having: {{{ ➜ cat test2.hs main = foo ➜ ghc --make -fforce-recomp -Wall ./test2.hs [1 of 1] Compiling Main ( test2.hs, test2.o ) test2.hs:1:8: Error: Not in scope: ‘foo’ }}} == Motivation == Main motivation point right now is that there's a ticket #9219 (parallel build's output of errors doesn't occur at the end of output), due to which, error-reporting of your program might get lost somewhere in the middle of a build-log. As another example, if your program has a lot of warnings, and you build it with multiple cores, you almost always get an error lost somewhere in the middle of warnings and it's almost impossible to find. So, this feature's main purpose is to ease navigation in textual output of ghc in order to find errors quickly, not being tied to output ordering. == Disadvantages == Many regression tests might need a fix. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10021#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler