diff options
Diffstat (limited to 'testsuite/tests/typecheck/should_fail/tcfail125.hs')
| -rw-r--r-- | testsuite/tests/typecheck/should_fail/tcfail125.hs | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_fail/tcfail125.hs b/testsuite/tests/typecheck/should_fail/tcfail125.hs new file mode 100644 index 0000000000..664354d840 --- /dev/null +++ b/testsuite/tests/typecheck/should_fail/tcfail125.hs @@ -0,0 +1,11 @@ +{-# LANGUAGE DatatypeContexts, ExistentialQuantification #-} + +-- Tests the "stupid theta" in pattern-matching +-- when there's an existential as well + +module ShouldCompile where + +data (Show a) => Obs a = forall b. LiftObs a b + +f :: Obs a -> String -- Needs a (Show a) context +f (LiftObs _ _) = "yes" |