diff options
Diffstat (limited to 'testsuite/tests/typecheck/should_compile/tc133.hs')
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/tc133.hs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/tc133.hs b/testsuite/tests/typecheck/should_compile/tc133.hs new file mode 100644 index 0000000000..8b378a4f00 --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/tc133.hs @@ -0,0 +1,16 @@ +{-# LANGUAGE ExistentialQuantification, ScopedTypeVariables #-} + +-- !!! Existentials + +-- This one killed GHC 5.00.1: +-- Inferred type is less polymorphic than expected +-- Quantified type variable `a' is unified with another quantified type variable `a' +-- When checking a pattern that binds f :: a -> Int +-- In the definition of `f': f (T (x :: a) f) = T (undefined :: a) f + +module Test where + +data T = forall a. T a (a->Int) + +f :: T -> T +f (T (x::a) f) = T (undefined::a) f |