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Diffstat (limited to 'testsuite/tests/typecheck/should_compile/tc129.hs')
-rw-r--r-- | testsuite/tests/typecheck/should_compile/tc129.hs | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_compile/tc129.hs b/testsuite/tests/typecheck/should_compile/tc129.hs new file mode 100644 index 0000000000..56163ffe31 --- /dev/null +++ b/testsuite/tests/typecheck/should_compile/tc129.hs @@ -0,0 +1,18 @@ +{-# LANGUAGE ImplicitParams #-} + +-- !!! Test inheritance of implicit parameters. +-- GHC 5.00.2 fails this test + +-- The thing is to do with whether an implicit parameter +-- constraint can be "inherited". See notes in TcSimplify.lhs + +module ShouldCompile where + +data R = R {f :: Int} + +foo :: (?x :: Int) => R -> R +foo r = r {f = ?x} + +baz :: (?x :: Int) => Int +baz = (?x +1) :: Int + |