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Don't rely on upvars being assigned just because coroutine-closure kind is assigned #123662

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Apr 9, 2024

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Previously, code relied on the implicit assumption that if a coroutine-closure's kind variable was constrained, then its upvars were also constrained. This is because we assign all of them at once at the end up upvar analysis.

However, there's another way that a coroutine-closure's kind can be constrained: from a signature hint in closure signature deduction. After #123350, we use these hints, which means the implicit assumption above no longer holds.

This PR adds the necessary checks so that we don't ICE.

r? oli-obk

@compiler-errors compiler-errors marked this pull request as ready for review April 9, 2024 02:46
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rustbot commented Apr 9, 2024

Some changes occurred to the core trait solver

cc @rust-lang/initiative-trait-system-refactor

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative labels Apr 9, 2024
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oli-obk commented Apr 9, 2024

@bors r+ rollup

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bors commented Apr 9, 2024

📌 Commit 6f96d7d has been approved by oli-obk

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Apr 9, 2024
GuillaumeGomez added a commit to GuillaumeGomez/rust that referenced this pull request Apr 9, 2024
…li-obk

Don't rely on upvars being assigned just because coroutine-closure kind is assigned

Previously, code relied on the implicit assumption that if a coroutine-closure's kind variable was constrained, then its upvars were also constrained. This is because we assign all of them at once at the end up upvar analysis.

However, there's another way that a coroutine-closure's kind can be constrained: from a signature hint in closure signature deduction. After rust-lang#123350, we use these hints, which means the implicit assumption above no longer holds.

This PR adds the necessary checks so that we don't ICE.

r? oli-obk
bors added a commit to rust-lang-ci/rust that referenced this pull request Apr 9, 2024
…llaumeGomez

Rollup of 6 pull requests

Successful merges:

 - rust-lang#123485 (macOS: Use `libc` definitions for copyfile)
 - rust-lang#123633 (Store all args in the unsupported Command implementation)
 - rust-lang#123638 (rustdoc: synthetic auto: filter out clauses from the implementor's ParamEnv)
 - rust-lang#123653 (Split `non_local_definitions` lint tests in separate test files)
 - rust-lang#123662 (Don't rely on upvars being assigned just because coroutine-closure kind is assigned)
 - rust-lang#123665 (Fix typo in `Future::poll()` docs)

r? `@ghost`
`@rustbot` modify labels: rollup
bors added a commit to rust-lang-ci/rust that referenced this pull request Apr 9, 2024
…llaumeGomez

Rollup of 8 pull requests

Successful merges:

 - rust-lang#123254 (Do not allocate for ZST ThinBox (attempt 2 using const_allocate))
 - rust-lang#123626 (Add MC/DC support to coverage test tools)
 - rust-lang#123638 (rustdoc: synthetic auto: filter out clauses from the implementor's ParamEnv)
 - rust-lang#123653 (Split `non_local_definitions` lint tests in separate test files)
 - rust-lang#123658 (Stop making any assumption about the projections applied to the upvars in the `ByMoveBody` pass)
 - rust-lang#123662 (Don't rely on upvars being assigned just because coroutine-closure kind is assigned)
 - rust-lang#123665 (Fix typo in `Future::poll()` docs)
 - rust-lang#123672 (compiletest: unset `RUSTC_LOG_COLOR`)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit e5b2935 into rust-lang:master Apr 9, 2024
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@rustbot rustbot added this to the 1.79.0 milestone Apr 9, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Apr 9, 2024
Rollup merge of rust-lang#123662 - compiler-errors:no-upvars-yet, r=oli-obk

Don't rely on upvars being assigned just because coroutine-closure kind is assigned

Previously, code relied on the implicit assumption that if a coroutine-closure's kind variable was constrained, then its upvars were also constrained. This is because we assign all of them at once at the end up upvar analysis.

However, there's another way that a coroutine-closure's kind can be constrained: from a signature hint in closure signature deduction. After rust-lang#123350, we use these hints, which means the implicit assumption above no longer holds.

This PR adds the necessary checks so that we don't ICE.

r? oli-obk
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4 participants