diff options
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/T12919.hs | 22 | ||||
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/all.T | 1 |
2 files changed, 23 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/T12919.hs b/testsuite/tests/typecheck/should_compile/T12919.hs new file mode 100644 index 0000000000..1f77c1c8de --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/T12919.hs @@ -0,0 +1,22 @@ +{-# LANGUAGE TypeInType, TypeFamilies, GADTs, ConstraintKinds #-} + +module T12919 where + +import Data.Kind + +data N = Z + +data V :: N -> Type where + VZ :: V Z + +type family VC (n :: N) :: Type where + VC Z = Type + +type family VF (xs :: V n) (f :: VC n) :: Type where + VF VZ f = f + +data Dict c where + Dict :: c => Dict c + +prop :: xs ~ VZ => Dict (VF xs f ~ f) +prop = Dict diff --git a/testsuite/tests/typecheck/should_compile/all.T b/testsuite/tests/typecheck/should_compile/all.T index e2d65bdb19..088c6fa5d3 100644 --- a/testsuite/tests/typecheck/should_compile/all.T +++ b/testsuite/tests/typecheck/should_compile/all.T @@ -556,3 +556,4 @@ test('T12734a', normal, compile_fail, ['']) test('T12763', normal, compile, ['']) test('T12797', normal, compile, ['']) test('T12925', normal, compile, ['']) +test('T12919', expect_broken(12919), compile, ['']) |