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authorRichard Eisenberg <eir@cis.upenn.edu>2015-12-11 18:19:53 -0500
committerRichard Eisenberg <eir@cis.upenn.edu>2015-12-11 18:23:12 -0500
commit6746549772c5cc0ac66c0fce562f297f4d4b80a2 (patch)
tree96869fcfb5757651462511d64d99a3712f09e7fb /testsuite/tests/polykinds/PolyKinds02.stderr
parent6e56ac58a6905197412d58e32792a04a63b94d7e (diff)
downloadhaskell-6746549772c5cc0ac66c0fce562f297f4d4b80a2.tar.gz
Add kind equalities to GHC.
This implements the ideas originally put forward in "System FC with Explicit Kind Equality" (ICFP'13). There are several noteworthy changes with this patch: * We now have casts in types. These change the kind of a type. See new constructor `CastTy`. * All types and all constructors can be promoted. This includes GADT constructors. GADT pattern matches take place in type family equations. In Core, types can now be applied to coercions via the `CoercionTy` constructor. * Coercions can now be heterogeneous, relating types of different kinds. A coercion proving `t1 :: k1 ~ t2 :: k2` proves both that `t1` and `t2` are the same and also that `k1` and `k2` are the same. * The `Coercion` type has been significantly enhanced. The documentation in `docs/core-spec/core-spec.pdf` reflects the new reality. * The type of `*` is now `*`. No more `BOX`. * Users can write explicit kind variables in their code, anywhere they can write type variables. For backward compatibility, automatic inference of kind-variable binding is still permitted. * The new extension `TypeInType` turns on the new user-facing features. * Type families and synonyms are now promoted to kinds. This causes trouble with parsing `*`, leading to the somewhat awkward new `HsAppsTy` constructor for `HsType`. This is dispatched with in the renamer, where the kind `*` can be told apart from a type-level multiplication operator. Without `-XTypeInType` the old behavior persists. With `-XTypeInType`, you need to import `Data.Kind` to get `*`, also known as `Type`. * The kind-checking algorithms in TcHsType have been significantly rewritten to allow for enhanced kinds. * The new features are still quite experimental and may be in flux. * TODO: Several open tickets: #11195, #11196, #11197, #11198, #11203. * TODO: Update user manual. Tickets addressed: #9017, #9173, #7961, #10524, #8566, #11142. Updates Haddock submodule.
Diffstat (limited to 'testsuite/tests/polykinds/PolyKinds02.stderr')
-rw-r--r--testsuite/tests/polykinds/PolyKinds02.stderr11
1 files changed, 6 insertions, 5 deletions
diff --git a/testsuite/tests/polykinds/PolyKinds02.stderr b/testsuite/tests/polykinds/PolyKinds02.stderr
index 7c5716a65e..b95cd4f207 100644
--- a/testsuite/tests/polykinds/PolyKinds02.stderr
+++ b/testsuite/tests/polykinds/PolyKinds02.stderr
@@ -1,5 +1,6 @@
-
-PolyKinds02.hs:13:16: error:
- The second argument of ‘Vec’ should have kind ‘Nat’,
- but ‘Nat’ has kind ‘*’
- In the type signature: vec :: Vec Nat Nat
+
+PolyKinds02.hs:13:16: error:
+ • Expected kind ‘Nat’, but ‘Nat’ has kind ‘*’
+ • In the second argument of ‘Vec’, namely ‘Nat’
+ In the type signature:
+ vec :: Vec Nat Nat