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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/traits/cache-reached-depth-ice.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/traits/cache-reached-depth-ice.rs')
-rw-r--r-- | tests/ui/traits/cache-reached-depth-ice.rs | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/tests/ui/traits/cache-reached-depth-ice.rs b/tests/ui/traits/cache-reached-depth-ice.rs new file mode 100644 index 000000000..c36ac0857 --- /dev/null +++ b/tests/ui/traits/cache-reached-depth-ice.rs @@ -0,0 +1,45 @@ +#![feature(rustc_attrs)] + +// Test for a particular corner case where the evaluation +// cache can get out of date. The problem here is that +// when we cache C, we have observed that it reaches +// to depth 2 (the node for B), but we later realize +// that B itself depends on A (reached depth 0). We +// failed to update the depth for C transitively, which +// resulted in an assertion failure when it was referenced +// from D. +// +// A (reached depth 0) +// E +// B // depth 2 -- reached depth = 0 +// C // depth 3 -- reached depth = 2 (should be 0) +// B +// A // depth 0 +// D (depth 1) +// C (cache -- reached depth = 2) + +struct A { + e: E, + d: C, +} + +struct E { + b: B, +} + +struct B { + a: Option<Box<A>>, + c: C, +} + +struct C { + b: Option<Box<B>>, +} + +#[rustc_evaluate_where_clauses] +fn test<X: ?Sized + Send>() {} + +fn main() { + test::<A>(); + //~^ ERROR evaluate(Binder(TraitPredicate(<A as std::marker::Send>, polarity:Positive), [])) = Ok(EvaluatedToOk) +} |