diff options
Diffstat (limited to 'testsuite/tests/indexed-types/should_compile/GADT14.hs')
| -rw-r--r-- | testsuite/tests/indexed-types/should_compile/GADT14.hs | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/testsuite/tests/indexed-types/should_compile/GADT14.hs b/testsuite/tests/indexed-types/should_compile/GADT14.hs new file mode 100644 index 0000000000..ace1de45da --- /dev/null +++ b/testsuite/tests/indexed-types/should_compile/GADT14.hs @@ -0,0 +1,11 @@ +{-# LANGUAGE TypeFamilies, TypeOperators, GADTs, RankNTypes, FlexibleContexts #-} +module Equality( (:=:), eq_elim, eq_refl ) where + +data a:=: b where + EQUAL :: a :=: a + +eq_refl :: a :=: a +eq_refl = EQUAL + +eq_elim :: (a~b) => a :=: b -> (a~b => p) -> p +eq_elim EQUAL p = p |