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| author | Richard Eisenberg <eir@seas.upenn.edu> | 2013-08-28 12:05:03 -0400 |
|---|---|---|
| committer | Richard Eisenberg <eir@cis.upenn.edu> | 2013-08-28 13:09:02 -0400 |
| commit | a7bc138e3393b86ef4681410f17fdc7010909fe3 (patch) | |
| tree | 37f520334f36ff38c105d47d0e0ac31bdfb2caf7 /testsuite/tests/indexed-types/should_fail | |
| parent | e06abacd7b49ee5c675e4426535e921860c2bfbd (diff) | |
| download | haskell-a7bc138e3393b86ef4681410f17fdc7010909fe3.tar.gz | |
Wibble to tests from improving comments about apartness.
Diffstat (limited to 'testsuite/tests/indexed-types/should_fail')
| -rw-r--r-- | testsuite/tests/indexed-types/should_fail/Overlap15.hs | 16 | ||||
| -rw-r--r-- | testsuite/tests/indexed-types/should_fail/Overlap15.stderr | 7 | ||||
| -rw-r--r-- | testsuite/tests/indexed-types/should_fail/all.T | 1 |
3 files changed, 24 insertions, 0 deletions
diff --git a/testsuite/tests/indexed-types/should_fail/Overlap15.hs b/testsuite/tests/indexed-types/should_fail/Overlap15.hs new file mode 100644 index 0000000000..c150a4028c --- /dev/null +++ b/testsuite/tests/indexed-types/should_fail/Overlap15.hs @@ -0,0 +1,16 @@ +{-# LANGUAGE TypeFamilies #-} + +-- In an ideal world, this would work. But, GHC doesn't implement +-- a full infinite-type unifier, so it can't figure out that F b [b] Bool +-- can safely reduce to Bool. + +module Overlap15 where + +import Data.Proxy + +type family F a b c where + F a a a = Int + F b c Bool = Bool + +foo :: Proxy b -> F b [b] Bool +foo _ = False diff --git a/testsuite/tests/indexed-types/should_fail/Overlap15.stderr b/testsuite/tests/indexed-types/should_fail/Overlap15.stderr new file mode 100644 index 0000000000..474bfd7983 --- /dev/null +++ b/testsuite/tests/indexed-types/should_fail/Overlap15.stderr @@ -0,0 +1,7 @@ + +Overlap15.hs:16:9: + Couldn't match expected type ‛F b [b] Bool’ with actual type ‛Bool’ + Relevant bindings include + foo :: Proxy * b -> F b [b] Bool (bound at Overlap15.hs:16:1) + In the expression: False + In an equation for ‛foo’: foo _ = False diff --git a/testsuite/tests/indexed-types/should_fail/all.T b/testsuite/tests/indexed-types/should_fail/all.T index 04d19abd16..14344da0bd 100644 --- a/testsuite/tests/indexed-types/should_fail/all.T +++ b/testsuite/tests/indexed-types/should_fail/all.T @@ -85,6 +85,7 @@ test('Overlap7', normal, compile_fail, ['']) test('Overlap9', normal, compile_fail, ['']) test('Overlap10', normal, compile_fail, ['']) test('Overlap11', normal, compile_fail, ['']) +test('Overlap15', normal, compile_fail, ['']) test('T7194', normal, compile_fail, ['']) test('T7354', normal, compile_fail, ['']) test('T7354a', |