diff options
Diffstat (limited to 'testsuite/tests/deSugar/should_run/dsrun009.hs')
| -rw-r--r-- | testsuite/tests/deSugar/should_run/dsrun009.hs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/testsuite/tests/deSugar/should_run/dsrun009.hs b/testsuite/tests/deSugar/should_run/dsrun009.hs new file mode 100644 index 0000000000..104f1af2e3 --- /dev/null +++ b/testsuite/tests/deSugar/should_run/dsrun009.hs @@ -0,0 +1,16 @@ +-- !!! Test that 'negate' is used properly to construct negative literals + +main = print (minusTwo,trueOrFalse) + +minusTwo = -2::N + +trueOrFalse = + case minusTwo of + -2 -> True + _ -> False + +data N = Negate N | FromInteger Integer deriving (Eq,Show) + +instance Num N where + negate = Negate + fromInteger = FromInteger |