diff options
Diffstat (limited to 'testsuite/tests/codeGen/should_fail/T13233_elab.hs')
| -rw-r--r-- | testsuite/tests/codeGen/should_fail/T13233_elab.hs | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/testsuite/tests/codeGen/should_fail/T13233_elab.hs b/testsuite/tests/codeGen/should_fail/T13233_elab.hs new file mode 100644 index 0000000000..87269769d9 --- /dev/null +++ b/testsuite/tests/codeGen/should_fail/T13233_elab.hs @@ -0,0 +1,33 @@ +-- Same as T13233, but we compile with -fprint-typechecker-elaboration. +-- The error message should show an eta-expanded call to (#,#). +-- See comments at https://gitlab.haskell.org/ghc/ghc/merge_requests/2540 +{-# LANGUAGE ScopedTypeVariables #-} +{-# LANGUAGE PolyKinds #-} +{-# LANGUAGE UnboxedTuples #-} +{-# LANGUAGE RankNTypes #-} +{-# LANGUAGE MagicHash #-} +module Bug where + +import GHC.Exts (TYPE, RuntimeRep, Weak#, State#, RealWorld, mkWeak# ) + +class Foo (a :: TYPE rep) where + bar :: forall rep2 (b :: TYPE rep2). (a -> a -> b) -> a -> a -> b + +baz :: forall rep (a :: TYPE rep). Foo a => a -> a -> (# a, a #) +baz = bar (#,#) + +obscure :: (forall (rep1 :: RuntimeRep) (rep2 :: RuntimeRep) + (a :: TYPE rep1) (b :: TYPE rep2). + a -> b -> (# a, b #)) -> () +obscure _ = () + +quux :: () +quux = obscure (#,#) + +-- It used to be that primops has no binding. However, as described in +-- Note [Primop wrappers] in PrimOp we now rewrite unsaturated primop +-- applications to their wrapper, which allows safe use of levity polymorphism. +primop :: forall (rep :: RuntimeRep) (a :: TYPE rep) b c. + a -> b -> (State# RealWorld -> (# State# RealWorld, c #)) + -> State# RealWorld -> (# State# RealWorld, Weak# b #) +primop = mkWeak# |