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| author | Krzysztof Gogolewski <krzysztof.gogolewski@tweag.io> | 2022-05-14 01:07:36 +0200 |
|---|---|---|
| committer | Krzysztof Gogolewski <krzysztof.gogolewski@tweag.io> | 2022-05-27 16:44:48 +0200 |
| commit | 3bd7d5d668b316f517a66c72fcf9bc7a36cc6ba4 (patch) | |
| tree | 186c133c0259d87f04b79c2017b7ee858b1b380a /testsuite/tests/typecheck/should_fail/T16646Fail2.stderr | |
| parent | ed37027f713bb6563fd98d144a39211339fd91a5 (diff) | |
| download | haskell-3bd7d5d668b316f517a66c72fcf9bc7a36cc6ba4.tar.gz | |
Use a class to check validity of withDictwip/withdict
This moves handling of the magic 'withDict' function from the desugarer
to the typechecker. Details in Note [withDict].
I've extracted a part of T16646Fail to a separate file T16646Fail2,
because the new error in 'reify' hides the errors from 'f' and 'g'.
WithDict now works with casts, this fixes #21328.
Part of #19915
Diffstat (limited to 'testsuite/tests/typecheck/should_fail/T16646Fail2.stderr')
| -rw-r--r-- | testsuite/tests/typecheck/should_fail/T16646Fail2.stderr | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/testsuite/tests/typecheck/should_fail/T16646Fail2.stderr b/testsuite/tests/typecheck/should_fail/T16646Fail2.stderr new file mode 100644 index 0000000000..7a8178136c --- /dev/null +++ b/testsuite/tests/typecheck/should_fail/T16646Fail2.stderr @@ -0,0 +1,16 @@ + +T16646Fail2.hs:19:13: error: + • Couldn't match type: b0 -> a + with: forall (proxy :: * -> *). proxy Any -> a + arising from a use of ‘withDict’ + • In the expression: + withDict @(Reifies (Any @Type) a) @_ (const a) (k @Any) Proxy + In an equation for ‘reify’: + reify a k + = withDict @(Reifies (Any @Type) a) @_ (const a) (k @Any) Proxy + • Relevant bindings include + k :: forall s. Reifies s a => Proxy s -> r + (bound at T16646Fail2.hs:19:9) + a :: a (bound at T16646Fail2.hs:19:7) + reify :: a -> (forall s. Reifies s a => Proxy s -> r) -> r + (bound at T16646Fail2.hs:19:1) |