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Diffstat (limited to 'testsuite/tests/typecheck/should_compile/tc208.hs')
| -rw-r--r-- | testsuite/tests/typecheck/should_compile/tc208.hs | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/tc208.hs b/testsuite/tests/typecheck/should_compile/tc208.hs new file mode 100644 index 0000000000..0bfb1d4e81 --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/tc208.hs @@ -0,0 +1,13 @@ +{-# LANGUAGE ImplicitParams, Rank2Types #-} + +-- This program failed to typecheck in an early version of +-- GHC with impredicative polymorphism, but it was fixed by +-- doing pre-subsumption in the subsumption check. +-- Trac bug #821 + +module ShouldCompile where + +type PPDoc = (?env :: Int) => Char + +f :: Char -> PPDoc +f = succ |