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match lowering: Lower bindings in a predictable order #121716

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merged 3 commits into from Mar 3, 2024

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After the recent refactorings, we can now lower bindings in a truly predictable order. The order in #120214 was an improvement but not very clear. With this PR, we lower bindings from left to right, with the special case that x @ pat is traversed as pat @ x (i.e. x is lowered after any bindings in pat).

This description only applies in the absence of or-patterns. Or-patterns make everything complicated, because the binding place depends on the subpattern. Until I have a better idea I leave them to be handled in whatever weird order arises from today's code.

r? @matthewjasper

For some reason it doesn't figure out the slice coercion.
@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. labels Feb 28, 2024
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@bors r+

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bors commented Mar 1, 2024

📌 Commit 00497ad has been approved by matthewjasper

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 Mar 1, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 2, 2024
Rollup of 5 pull requests

Successful merges:

 - rust-lang#120761 (Add initial support for DataFlowSanitizer)
 - rust-lang#121622 (Preserve same vtable pointer when cloning raw waker, to fix Waker::will_wake)
 - rust-lang#121716 (match lowering: Lower bindings in a predictable order)
 - rust-lang#121731 (Now that inlining, mir validation and const eval all use reveal-all, we won't be constraining hidden types here anymore)
 - rust-lang#121841 (`f16` and `f128` step 2: intrinsics)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 30976fb into rust-lang:master Mar 3, 2024
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@rustbot rustbot added this to the 1.78.0 milestone Mar 3, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Mar 3, 2024
Rollup merge of rust-lang#121716 - Nadrieril:simple-binding-order, r=matthewjasper

match lowering: Lower bindings in a predictable order

After the recent refactorings, we can now lower bindings in a truly predictable order. The order in rust-lang#120214 was an improvement but not very clear. With this PR, we lower bindings from left to right, with the special case that `x @ pat` is traversed as `pat @ x` (i.e. `x` is lowered after any bindings in `pat`).

This description only applies in the absence of or-patterns. Or-patterns make everything complicated, because the binding place depends on the subpattern. Until I have a better idea I leave them to be handled in whatever weird order arises from today's code.

r? `@matthewjasper`
@Nadrieril Nadrieril deleted the simple-binding-order branch March 3, 2024 01:30
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5 participants