Skip to content
GitLab
Menu
Projects
Groups
Snippets
Loading...
Help
Help
Support
Community forum
Keyboard shortcuts
?
Submit feedback
Sign in / Register
Toggle navigation
Menu
Open sidebar
Matthew Pickering
Glasgow Haskell Compiler
Commits
051d694f
Commit
051d694f
authored
Jun 10, 2014
by
eir@cis.upenn.edu
Browse files
Fix #9097.
`Any` is now an abstract (that is, no equations) closed type family.
parent
0f584ae3
Changes
2
Hide whitespace changes
Inline
Side-by-side
compiler/prelude/TysPrim.lhs
View file @
051d694f
...
...
@@ -701,7 +701,7 @@ threadIdPrimTyCon = pcPrimTyCon0 threadIdPrimTyConName PtrRep
Note [Any types]
~~~~~~~~~~~~~~~~
The type constructor Any of kind forall k. k
-> k
has these properties:
The type constructor Any of kind forall k. k has these properties:
* It is defined in module GHC.Prim, and exported so that it is
available to users. For this reason it's treated like any other
...
...
@@ -714,7 +714,7 @@ The type constructor Any of kind forall k. k -> k has these properties:
g :: ty ~ (Fst ty, Snd ty)
If Any was a *data* type, then we'd get inconsistency because 'ty'
could be (Any '(k1,k2)) and then we'd have an equality with Any on
one side and '(,) on the other
one side and '(,) on the other
. See also #9097.
* It is lifted, and hence represented by a pointer
...
...
@@ -771,20 +771,12 @@ anyTy :: Type
anyTy = mkTyConTy anyTyCon
anyTyCon :: TyCon
anyTyCon = mkLiftedPrimTyCon anyTyConName kind [Nominal] PtrRep
where kind = ForAllTy kKiVar (mkTyVarTy kKiVar)
{- Can't do this yet without messing up kind proxies
-- RAE: I think you can now.
anyTyCon :: TyCon
anyTyCon = mkSynTyCon anyTyConName kind [kKiVar]
anyTyCon = mkSynTyCon anyTyConName kind [kKiVar] [Nominal]
syn_rhs
NoParentTyCon
where
kind = ForAllTy kKiVar (mkTyVarTy kKiVar)
syn_rhs = SynFamilyTyCon { synf_open = False, synf_injective = True }
-- NB Closed, injective
-}
syn_rhs = AbstractClosedSynFamilyTyCon
anyTypeOfKind :: Kind -> Type
anyTypeOfKind kind = TyConApp anyTyCon [kind]
...
...
compiler/prelude/primops.txt.pp
View file @
051d694f
...
...
@@ -2437,7 +2437,7 @@ pseudoop "seq"
{ Evaluates its first argument to head normal form, and then returns its second
argument as the result. }
primtype Any
k
primtype Any
{ The type constructor {\tt Any} is type to which you can unsafely coerce any
lifted type, and back.
...
...
@@ -2462,8 +2462,11 @@ primtype Any k
{\tt length (Any *) ([] (Any *))}
Note that {\tt Any} is kind polymorphic, and takes a kind {\tt k} as its
first argument. The kind of {\tt Any} is thus {\tt forall k. k -> k}.}
Above, we print kinds explicitly, as if with
{\tt -fprint-explicit-kinds}.
Note that {\tt Any} is kind polymorphic; its kind is thus
{\tt forall k. k}.}
primtype AnyK
{ The kind {\tt AnyK} is the kind level counterpart to {\tt Any}. In a
...
...
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
.
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment