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| author | sheaf <sam.derbyshire@gmail.com> | 2021-10-05 18:16:27 +0200 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2021-10-06 10:58:03 -0400 |
| commit | a466b02492f73a43c6cb9ce69491fc85234b9559 (patch) | |
| tree | 6d4f7c1d0ad4609fa1878d44f0e1e20b8c4501ef /testsuite/tests/polykinds | |
| parent | 9af29e7fa81a8696a2d829a0ecbebcbc8be5badd (diff) | |
| download | haskell-a466b02492f73a43c6cb9ce69491fc85234b9559.tar.gz | |
Improve overlap error for polykinded constraints
There were two problems around `mkDictErr`:
1. An outdated call to `flattenTys` meant that we missed out on some
instances. As we no longer flatten type-family applications,
the logic is obsolete and can be removed.
2. We reported "out of scope" errors in a poly-kinded situation
because `BoxedRep` and `Lifted` were considered out of scope.
We fix this by using `pretendNameIsInScope`.
fixes #20465
Diffstat (limited to 'testsuite/tests/polykinds')
| -rw-r--r-- | testsuite/tests/polykinds/T13393.stderr | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/testsuite/tests/polykinds/T13393.stderr b/testsuite/tests/polykinds/T13393.stderr index a06aecff70..759f3408b0 100644 --- a/testsuite/tests/polykinds/T13393.stderr +++ b/testsuite/tests/polykinds/T13393.stderr @@ -7,8 +7,8 @@ T13393.hs:61:3: error: instance Traversable (Either a) -- Defined in ‘Data.Traversable’ instance Traversable Identity -- Defined in ‘Data.Traversable’ instance Traversable Maybe -- Defined in ‘Data.Traversable’ - ...plus three others - ...plus 28 instances involving out-of-scope types + ...plus N others + ...plus N instances involving out-of-scope types (use -fprint-potential-instances to see them all) • In a stmt of a 'do' block: mapM putBackLeftOverInputAndReturnOutput undefined |