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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/impl-trait/wf-eval-order.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/impl-trait/wf-eval-order.rs')
-rw-r--r-- | src/test/ui/impl-trait/wf-eval-order.rs | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/wf-eval-order.rs b/src/test/ui/impl-trait/wf-eval-order.rs new file mode 100644 index 000000000..c7d6bb870 --- /dev/null +++ b/src/test/ui/impl-trait/wf-eval-order.rs @@ -0,0 +1,39 @@ +// Check that we handle evaluating `wf` predicates correctly. + +// check-pass + +struct X<T: B>(T) +where + T::V: Clone; + +fn hide<T>(t: T) -> impl Sized { + t +} + +trait A { + type U; +} + +impl<T> A for T { + type U = T; +} + +trait B { + type V; +} + +impl<S: A<U = T>, T> B for S { + type V = T; +} + +fn main() { + // Evaluating `typeof(x): Sized` requires + // + // - `wf(typeof(x))` because we use a projection candidate. + // - `<i32 as B>::V: Clone` because that's a bound on the trait. + // - `<i32 as B>::V` normalizes to `_#1` where `<i32 as A>::U == _#1` + // + // This all works if we evaluate `<i32 as A>::U == _#1` before + // `<i32 as B>::V`, but we previously had the opposite order. + let x = hide(X(0)); +} |