chalk: Fix wrong debrujin index in opaque type handling.#94235
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bors merged 3 commits intorust-lang:masterfrom Feb 26, 2022
Merged
chalk: Fix wrong debrujin index in opaque type handling.#94235bors merged 3 commits intorust-lang:masterfrom
bors merged 3 commits intorust-lang:masterfrom
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…r=jackh726 chalk: Fix wrong debrujin index in opaque type handling. A folder in opaque type lowering was substituting all opaque type references with a variable with debrujin index 0 ignoring how many binders deep we are. This caused an ICE with `Not enough bound vars: ^0 not found in []` ([full logs](https://gist.github.com/Dirbaio/2b9374ff4fce37afb9d665dc9f0000df)) with the following code. ```rust fn main() -> () {} async fn foo(x: u32) -> u32 { x } ``` With the fix, it no longer ICEs. It still doesn't typecheck due to generator issues. I've added a "known-bug" test so that at least it doesn't regress back to ICEing. r? `@jackh726`
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…askrgr Rollup of 5 pull requests Successful merges: - rust-lang#93400 (Do not suggest using a const parameter when there are bounds on an unused type parameter) - rust-lang#93982 (Provide extra note if synthetic type args are specified) - rust-lang#94087 (Remove unused `unsound_ignore_borrow_on_drop`) - rust-lang#94235 (chalk: Fix wrong debrujin index in opaque type handling.) - rust-lang#94306 (Avoid exhausting stack space in dominator compression) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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A folder in opaque type lowering was substituting all opaque type references with a variable with debrujin index 0 ignoring how many binders deep we are.
This caused an ICE with
Not enough bound vars: ^0 not found in [](full logs) with the following code.With the fix, it no longer ICEs. It still doesn't typecheck due to generator issues. I've added a "known-bug" test so that at least it doesn't regress back to ICEing.
r? @jackh726