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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/ui/nll/relate_tys/impl-fn-ignore-binder-via-bottom.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/nll/relate_tys/impl-fn-ignore-binder-via-bottom.rs')
-rw-r--r-- | tests/ui/nll/relate_tys/impl-fn-ignore-binder-via-bottom.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/nll/relate_tys/impl-fn-ignore-binder-via-bottom.rs b/tests/ui/nll/relate_tys/impl-fn-ignore-binder-via-bottom.rs new file mode 100644 index 000000000..05e2ea047 --- /dev/null +++ b/tests/ui/nll/relate_tys/impl-fn-ignore-binder-via-bottom.rs @@ -0,0 +1,34 @@ +// Test that the NLL solver cannot find a solution +// for `exists<R1> { forall<R1> { R2: R1 } }`. +// +// In this test, the impl should match `fn(T)` for some `T`, +// but we ask it to match `for<'a> fn(&'a ())`. Due to argument +// contravariance, this effectively requires a `T = &'b ()` where +// `forall<'a> { 'a: 'b }`. Therefore, we get an error. +// +// Note the use of `-Zno-leak-check` here. This is presently required in order +// to skip the leak-check errors. +// +// c.f. Issue #57642. +// +// compile-flags:-Zno-leak-check + +trait Y { + type F; + fn make_f() -> Self::F; +} + +impl<T> Y for fn(T) { + type F = fn(T); + + fn make_f() -> Self::F { + |_| {} + } +} + +fn main() { + let _x = <fn(&())>::make_f(); + //~^ ERROR implementation of `Y` is not general enough + //~| ERROR implementation of `Y` is not general enough + //~| ERROR implementation of `Y` is not general enough +} |