[GHC] #12488: Explicit namespaces doesn't enforce namespaces
#12488: Explicit namespaces doesn't enforce namespaces -------------------------------------+------------------------------------- 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: -------------------------------------+------------------------------------- It seems to me that the type keyword should permanently enforce that a RdrName lives in a particular namespace. Currently it only acts as a syntactic marker so that type constructors which looks like variables can be included in export lists. The following example is accepted by GHC. As `A` is parsed as a type constructor but later put into the data constructor namespace. {{{#!hs {-# LANGUAGE ExplicitNamespaces #-} {-# LANGUAGE TypeFamilies #-} module M ( T (type A) ) where data T = A class Foo a where type A a foo :: a -> Int }}} The fix is to track uses of ExplicitNamespaces in the AST and then use this information in the renamer. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12488 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12488: Explicit namespaces doesn't enforce namespaces -------------------------------------+------------------------------------- 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 mpickering): Simon says that we should just reject this in the parser. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12488#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12488: Explicit namespaces doesn't enforce namespaces -------------------------------------+------------------------------------- Reporter: mpickering | Owner: ruperthorlick 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 ruperthorlick): * owner: (none) => ruperthorlick -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12488#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12488: Explicit namespaces doesn't enforce namespaces -------------------------------------+------------------------------------- Reporter: mpickering | Owner: ruperthorlick 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 ruperthorlick): Replying to [comment:1 mpickering]:
Simon says that we should just reject the use of explicit namespace qualifiers in the subcomponents of the export item in the parser.
This would work and be a fairly easy change, however I stumled across the following in DynFlags.hs: {{{ -- We turn this on so that we can export associated type -- type synonyms in subordinates (e.g. MyClass(type AssocType)) , (LangExt.TypeFamilies, turnOn, LangExt.ExplicitNamespaces) }}} So for the above they might want to export `Foo (type A)` Does this mean we need something more complicated? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12488#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#12488: Explicit namespaces doesn't enforce namespaces -------------------------------------+------------------------------------- Reporter: mpickering | Owner: (none) 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 mpickering): * owner: ruperthorlick => (none) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12488#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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