diff --git a/ghc/tests/deriving/should_fail/drvfail001.hs b/ghc/tests/deriving/should_fail/drvfail001.hs new file mode 100644 index 0000000000000000000000000000000000000000..aa7867f34f63eea142951b0b23f6ae065e1f373b --- /dev/null +++ b/ghc/tests/deriving/should_fail/drvfail001.hs @@ -0,0 +1,25 @@ +{- From: Ian Bayley + Sent: Tuesday, June 29, 1999 3:39 PM + To: hugs-bugs@haskell.org + Subject: Show for higher-order nested datatypes + + + Is "deriving Show" meant to work for higher-order nested datatypes ? + Hugs hangs when loading in the following file: +-} + +module Foo where + +type SqMat a = SM Nil a + +data SM f a = ZeroS (f (f a)) | SuccS (SM (Cons f) a) + deriving Show + + +data Nil a = MkNil deriving Show + +data Cons f a = MkCons a (f a) + deriving Show + + + diff --git a/ghc/tests/deriving/should_fail/drvfail001.stderr b/ghc/tests/deriving/should_fail/drvfail001.stderr new file mode 100644 index 0000000000000000000000000000000000000000..887f7cd25ed00177fbf80959ac839279a0a2306f --- /dev/null +++ b/ghc/tests/deriving/should_fail/drvfail001.stderr @@ -0,0 +1,7 @@ + +drvfail001.hs:11: + No instance for `Show (f (f a))' + When deriving classes for `SM' + +Compilation had errors +