Files
third_party_rust_rust/tests/ui
Dylan DPC 8ea6954d0c Rollup merge of #110614 - compiler-errors:new-solver-overflow-response, r=lcnr
Clear response values for overflow in new solver

When we have an overflow, return a trivial query response. This fixes an ICE with the code described in #110544:

```rust
trait Trait {}

struct W<T>(T);

impl<T, U> Trait for W<(W<T>, W<U>)>
where
    W<T>: Trait,
    W<U>: Trait,
{}

fn impls<T: Trait>() {}

fn main() {
    impls::<W<_>>()
}
```

Where, while proving `W<?0>: Trait`, we overflow but still apply the query response of `?0 = (W<?1>, W<?2>)`. Then while re-processing the query to validate that our evaluation result was stable, we get a different query response that looks like `?1 = (W<?3>, W<?4>), ?2 = (W<?5>, W<?6>)`, and so we trigger the ICE.

Also, by returning a trivial query response we also avoid the infinite-loop/OOM behavior of the old solver.

r? ``@lcnr``
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