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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:50 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:50 +0000 |
commit | 2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35 (patch) | |
tree | d325add32978dbdc1db975a438b3a77d571b1ab8 /tests/ui/traits/new-solver/normalizes_to_ignores_unnormalizable_candidate.rs | |
parent | Releasing progress-linux version 1.68.2+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35.tar.xz rustc-2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35.zip |
Merging upstream version 1.69.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/traits/new-solver/normalizes_to_ignores_unnormalizable_candidate.rs')
-rw-r--r-- | tests/ui/traits/new-solver/normalizes_to_ignores_unnormalizable_candidate.rs | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/tests/ui/traits/new-solver/normalizes_to_ignores_unnormalizable_candidate.rs b/tests/ui/traits/new-solver/normalizes_to_ignores_unnormalizable_candidate.rs new file mode 100644 index 000000000..46343241b --- /dev/null +++ b/tests/ui/traits/new-solver/normalizes_to_ignores_unnormalizable_candidate.rs @@ -0,0 +1,40 @@ +// [no_self_infer] check-pass +// compile-flags: -Ztrait-solver=next +// revisions: self_infer no_self_infer + +// checks that the new solver is smart enough to infer `?0 = U` when solving: +// `normalizes-to(<Vec<?0> as Trait>::Assoc, u8)` +// with `normalizes-to(<Vec<U> as Trait>::Assoc, u8)` in the paramenv even when +// there is a separate `Vec<T>: Trait` bound in the paramenv. +// +// FIXME(-Ztrait-solver=next) +// This could also compile for `normalizes-to(<?0 as Trait>::Assoc, u8)` but +// we currently immediately consider a goal ambiguous if the self type is an +// inference variable. + +trait Trait { + type Assoc; +} + +fn foo<T: Trait<Assoc = u8>>(x: T) {} + +#[cfg(self_infer)] +fn unconstrained<T>() -> T { + todo!() +} + +#[cfg(no_self_infer)] +fn unconstrained<T>() -> Vec<T> { + todo!() +} + +fn bar<T, U>() +where + Vec<T>: Trait, + Vec<U>: Trait<Assoc = u8>, +{ + foo(unconstrained()) + //[self_infer]~^ ERROR type annotations needed +} + +fn main() {} |