#11386: Improve error message -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: task | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{ Prelude> class (A, B) <interactive>:16:8: error: Unexpected type ‘A’ In the class declaration for ‘GHC.Classes.(%,%)’ A class declaration should have form class GHC.Classes.(%,%) a b where ... }}} in 7.10.2 it gave the more sensible {{{ ghci> class (A, B) <interactive>:30:7: Malformed head of type or class declaration: (A, B) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11386 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11386: Improve error message -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: task | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #10362 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by Iceland_jack): * related: => #10362 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11386#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11386: Improve error message -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: task | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #10362 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Iceland_jack): Simon says "There should be no user-visible effects." in ticket #10362. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11386#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11386: Improve error message -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: task | Status: new Priority: high | Milestone: 8.0.1 Component: Compiler | Version: 8.0.1-rc1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #10362 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * priority: normal => high * failure: None/Unknown => Incorrect warning at compile-time * version: 8.1 => 8.0.1-rc1 * milestone: => 8.0.1 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11386#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11386: Improve error message -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: task | Status: new Priority: high | Milestone: 8.0.1 Component: Compiler | Version: 8.0.1-rc1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #10362 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): If you had written {{{ class T A b }}} Then the error would have been fine. What is special here? Just that it's using a type constructor that has built-in syntax. I expect I could add a special case to dis-allow such class declarations, and I agree this one is strange because of the `%` signs. But is it really worth the trouble? Will people do this much? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11386#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11386: Improve error message -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: task | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.0.1-rc1 Resolution: wontfix | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #10362 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * priority: high => normal * status: new => closed * resolution: => wontfix * milestone: 8.0.1 => Comment: There wasn't really a consensus that special-casing this was worthwhile. Feel free to re-open if you disagree. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11386#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11386: Improve error message -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: task | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.0.1-rc1 Resolution: wontfix | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: #10362 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Iceland_jack): I'm fine with closing it -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11386#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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