[GHC] #12978: User guide section on AllowAmbiguousTypes should mention TypeApplications
#12978: User guide section on AllowAmbiguousTypes should mention TypeApplications -------------------------------------+------------------------------------- Reporter: mpickering | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: newcomer | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/glasgow_exts... #ghc-flag--XAllowAmbiguousTypes With type applications it is tempting to write {{{ class C x a where meth :: a }}} which will fail the ambiguity check as `x` is not used in any methods. One way to get around this is to use `TypeApplications` in order to specify what `x` should be at each usage of `meth`. A small section in the user guide explaining this and linking to the section on `TypeApplications` would be useful. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12978 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12978: User guide section on AllowAmbiguousTypes should mention TypeApplications -------------------------------------+------------------------------------- Reporter: mpickering | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 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): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Good idea! I think that would be great. Would you like to draft it? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12978#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12978: User guide section on AllowAmbiguousTypes should mention TypeApplications -------------------------------------+------------------------------------- Reporter: mpickering | Owner: erdeszt Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 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): Wiki Page: | -------------------------------------+------------------------------------- Changes (by erdeszt): * owner: (none) => erdeszt -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12978#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12978: User guide section on AllowAmbiguousTypes should mention TypeApplications -------------------------------------+------------------------------------- Reporter: mpickering | Owner: erdeszt Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 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): Phab:D3668 Wiki Page: | -------------------------------------+------------------------------------- Changes (by erdeszt): * differential: => Phab:D3668 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12978#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12978: User guide section on AllowAmbiguousTypes should mention TypeApplications
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Reporter: mpickering | Owner: erdeszt
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 8.0.1
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): Phab:D3668
Wiki Page: |
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Comment (by Ben Gamari
#12978: User guide section on AllowAmbiguousTypes should mention TypeApplications -------------------------------------+------------------------------------- Reporter: mpickering | Owner: erdeszt Type: bug | Status: closed Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1 Resolution: fixed | Keywords: newcomer Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D3668 Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: new => closed * resolution: => fixed * milestone: => 8.2.1 Comment: Merged to `ghc-8.2` as well. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12978#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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