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Diffstat (limited to 'testsuite/tests/typecheck/should_compile/tc119.hs')
-rw-r--r-- | testsuite/tests/typecheck/should_compile/tc119.hs | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/tc119.hs b/testsuite/tests/typecheck/should_compile/tc119.hs new file mode 100644 index 0000000000..e29cb6a72f --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/tc119.hs @@ -0,0 +1,15 @@ +{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies, + ExistentialQuantification #-} + +-- !!! Functional dependencies and existentials + +-- Hugs (February 2000) doesn't like it. It says +-- Variable "e" in constraint is not locally bound + +module ShouldCompile where + +class Collection c e | c -> e where + empty :: c + put :: c -> e -> c + +data SomeCollection e = forall c . Collection c e => MakeSomeCollection c |