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Diffstat (limited to 'testsuite/tests/typecheck/should_compile/tc116.hs')
-rw-r--r-- | testsuite/tests/typecheck/should_compile/tc116.hs | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/tc116.hs b/testsuite/tests/typecheck/should_compile/tc116.hs new file mode 100644 index 0000000000..eb93410bed --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/tc116.hs @@ -0,0 +1,18 @@ +{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies, + FlexibleInstances #-} +-- !!! Functional dependencies +-- This broke an early impl of functional dependencies +-- (caused a panic) + +module ShouldCompile where + +class Foo r a | r -> a where + foo :: r -> a + +instance Foo [m a] (m a) + +bad:: Monad m => m a +bad = foo bar + +bar:: [m a] +bar = [] |