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183458263b
These tests just need blessing, they don't have any interesting behaviour changes. Some of these tests have new errors because `LegacyReceiver` cannot be proven to be implemented now that it is also testing for `MetaSized` - but this is just a consequence of the other errors in the test.
47 lines
1.1 KiB
Rust
47 lines
1.1 KiB
Rust
#![feature(rustc_attrs, sized_hierarchy)]
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use std::marker::PointeeSized;
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// Test for a particular corner case where the evaluation
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// cache can get out of date. The problem here is that
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// when we cache C, we have observed that it reaches
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// to depth 2 (the node for B), but we later realize
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// that B itself depends on A (reached depth 0). We
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// failed to update the depth for C transitively, which
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// resulted in an assertion failure when it was referenced
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// from D.
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//
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// A (reached depth 0)
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// E
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// B // depth 2 -- reached depth = 0
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// C // depth 3 -- reached depth = 2 (should be 0)
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// B
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// A // depth 0
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// D (depth 1)
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// C (cache -- reached depth = 2)
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struct A {
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e: E,
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d: C,
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}
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struct E {
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b: B,
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}
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struct B {
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a: Option<Box<A>>,
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c: C,
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}
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struct C {
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b: Option<Box<B>>,
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}
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#[rustc_evaluate_where_clauses]
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fn test<X: PointeeSized + Send>() {}
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fn main() {
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test::<A>();
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//~^ ERROR evaluate(Binder { value: TraitPredicate(<A as std::marker::Send>, polarity:Positive), bound_vars: [] }) = Ok(EvaluatedToOk)
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}
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