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Rollup merge of #107799 - lcnr:update-provisional-result, r=oli-obk
correctly update goals in the cache we may want to actually write the response for our goal into the provisional or global cache instead of simply using the result from the last iteration '^^ r? ```@rust-lang/initiative-trait-system-refactor```
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// known-bug: unknown | ||
// compile-flags: -Ztrait-solver=next | ||
// failure-status: 101 | ||
// normalize-stderr-test "note: .*\n\n" -> "" | ||
// normalize-stderr-test "thread 'rustc' panicked.*\n" -> "" | ||
// rustc-env:RUST_BACKTRACE=0 | ||
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// This tests checks that we update results in the provisional cache when | ||
// we pop a goal from the stack. | ||
#![feature(auto_traits)] | ||
auto trait Coinductive {} | ||
struct Foo<T>(T); | ||
struct Bar<T>(T); | ||
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impl<T> Coinductive for Foo<T> | ||
where | ||
Bar<T>: Coinductive | ||
{} | ||
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impl<T> Coinductive for Bar<T> | ||
where | ||
Foo<T>: Coinductive, | ||
Bar<T>: ConstrainInfer, | ||
{} | ||
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trait ConstrainInfer {} | ||
impl ConstrainInfer for Bar<u8> {} | ||
impl ConstrainInfer for Foo<u16> {} | ||
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fn impls<T: Coinductive>() -> T { todo!() } | ||
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fn constrain<T: ConstrainInfer>(_: T) {} | ||
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fn main() { | ||
// This should constrain `_` to `u8`. | ||
impls::<Foo<_>>(); | ||
} |
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error: the compiler unexpectedly panicked. this is a bug. | ||
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query stack during panic: | ||
#0 [check_well_formed] checking that `<impl at $DIR/provisional-result-done.rs:20:1: 20:31>` is well-formed | ||
#1 [check_mod_type_wf] checking that types are well-formed in top-level module | ||
end of query stack |