Adopt let_else across the compiler #89933

est31 · 2021-10-16T02:48:03Z

This performs a substitution of code following the pattern:

let <id> = if let <pat> = ... { identity } else { ... : ! };

To simplify it to:

let <pat> = ... { identity } else { ... : ! };

By adopting the let_else feature (cc #87335).

The PR also updates the syn crate because the currently used version of the crate doesn't support let_else syntax yet.

Note: Generally I'm the person who removes usages of unstable features from the compiler, not adds more usages of them, but in this instance I think it hopefully helps the feature get stabilized sooner and in a better state. I have written a comment on the tracking issue about my experience and what I feel could be improved before stabilization of let_else.

rust-highfive · 2021-10-16T02:48:07Z

r? @michaelwoerister

(rust-highfive has picked a reviewer for you, use r? to override)

Mark-Simulacrum · 2021-10-16T03:14:12Z

@bors try @rust-timer queue

rust-timer · 2021-10-16T03:14:13Z

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

bors · 2021-10-16T03:14:22Z

⌛ Trying commit 17797d5691063017a8894d4db7518a7f8617ccc1 with merge e0d9b8920dbe7b71564ff8df6724a83e6d480c7f...

compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs

This performs a substitution of code following the pattern: let <id> = if let <pat> = ... { identity } else { ... : ! }; To simplify it to: let <pat> = ... { identity } else { ... : ! }; By adopting the let_else feature.

The syn crate has gained support for let_else syntax in version 1.0.76, see dtolnay/syn#1057 . In the three instances that use let_else, we've sent code through an attr macro, which would create compile errors when there was no let_else support in syn. To avoid this, we ran `cargo +nightly update -p syn` for updating the syn crate.

est31 · 2021-10-16T05:38:37Z

@bors try

bors · 2021-10-16T05:38:45Z

⌛ Trying commit ef018be with merge 1ff7b3040dc925f0d5d8872b6c24e700c1bdb05d...

bors · 2021-10-16T07:07:28Z

☀️ Try build successful - checks-actions
Build commit: 1ff7b3040dc925f0d5d8872b6c24e700c1bdb05d (1ff7b3040dc925f0d5d8872b6c24e700c1bdb05d)

rust-timer · 2021-10-16T07:07:30Z

Queued 1ff7b3040dc925f0d5d8872b6c24e700c1bdb05d with parent 6cc0a76, future comparison URL.

rust-timer · 2021-10-16T08:40:05Z

Finished benchmarking commit (1ff7b3040dc925f0d5d8872b6c24e700c1bdb05d): comparison url.

Summary: This benchmark run did not return any relevant changes.

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR led to changes in compiler perf.

@bors rollup=never
@rustbot label: +S-waiting-on-review -S-waiting-on-perf -perf-regression

joshtriplett · 2021-10-16T09:34:43Z

This looks great! Thanks for the demonstration of how this applies.

michaelwoerister · 2021-10-18T14:05:35Z

Very nice! Thanks, @est31!

@bors r+

bors · 2021-10-18T14:05:36Z

📌 Commit ef018be has been approved by michaelwoerister

bors · 2021-10-19T14:41:42Z

⌛ Testing commit ef018be with merge 1af55d1...

bors · 2021-10-19T17:38:42Z

☀️ Test successful - checks-actions
Approved by: michaelwoerister
Pushing 1af55d1 to master...

rust-timer · 2021-10-19T19:10:22Z

Finished benchmarking commit (1af55d1): comparison url.

Summary: This change led to moderate relevant improvements 🎉 in compiler performance.

Moderate improvement in instruction counts (up to -0.8% on incr-unchanged builds of deeply-nested-async)

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

est31 · 2021-10-19T20:34:51Z

Glad to see an improvement, even if it's only very small. Not sure why it is one though, likely it's just noise.

Adopt let_else in more places in rustc_mir_build Helps avoid rightward drift. followup of rust-lang#89933

Use let_else in some more places in rustc_lint Follow-up of rust-lang#91018 and rust-lang#89933 . Also cc rust-lang#90985 which added the first let_else uses to rustc_lint.

Use let_else in even more places Followup of rust-lang#89933, rust-lang#91018, rust-lang#91481.

More let_else adoptions Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046.

Even more let_else adoptions Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590.

Adopt let else in more places Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011. I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This is the biggest of these PRs and handles the changes outside of rustdoc, rustc_typeck, rustc_const_eval, rustc_trait_selection, which were handled in PRs rust-lang#94139, rust-lang#94142, rust-lang#94143, rust-lang#94144.

rustc_typeck: adopt let else in more places Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011. I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This PR handles rustc_typeck.

Adopt let else in more places Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011. I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This is the biggest of these PRs and handles the changes outside of rustdoc, rustc_typeck, rustc_const_eval, rustc_trait_selection, which were handled in PRs rust-lang#94139, rust-lang#94142, rust-lang#94143, rust-lang#94144.

rustc_const_eval: adopt let else in more places Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011. I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This PR handles rustc_const_eval.

…jgillot rustc_trait_selection: adopt let else in more places Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011. I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This PR handles rustc_trait_selection.

…illot rustc_trait_selection: adopt let else in more places Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011. I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This PR handles rustc_trait_selection.

librustdoc: adopt let else in more places Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590, rust-lang#94011. I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This PR handles librustdoc.

…plett Stabilize `let else` :tada: **Stabilizes the `let else` feature, added by [RFC 3137](rust-lang/rfcs#3137 🎉 Reference PR: rust-lang/reference#1156 closes rust-lang#87335 (`let else` tracking issue) FCP: rust-lang#93628 (comment) ---------- ## Stabilization report ### Summary The feature allows refutable patterns in `let` statements if the expression is followed by a diverging `else`: ```Rust fn get_count_item(s: &str) -> (u64, &str) { let mut it = s.split(' '); let (Some(count_str), Some(item)) = (it.next(), it.next()) else { panic!("Can't segment count item pair: '{s}'"); }; let Ok(count) = u64::from_str(count_str) else { panic!("Can't parse integer: '{count_str}'"); }; (count, item) } assert_eq!(get_count_item("3 chairs"), (3, "chairs")); ``` ### Differences from the RFC / Desugaring Outside of desugaring I'm not aware of any differences between the implementation and the RFC. The chosen desugaring has been changed from the RFC's [original](https://rust-lang.github.io/rfcs/3137-let-else.html#reference-level-explanations). You can read a detailed discussion of the implementation history of it in `@cormacrelf` 's [summary](rust-lang#93628 (comment)) in this thread, as well as the [followup](rust-lang#93628 (comment)). Since that followup, further changes have happened to the desugaring, in rust-lang#98574, rust-lang#99518, rust-lang#99954. The later changes were mostly about the drop order: On match, temporaries drop in the same order as they would for a `let` declaration. On mismatch, temporaries drop before the `else` block. ### Test cases In chronological order as they were merged. Added by df9a2e0 (rust-lang#87688): * [`ui/pattern/usefulness/top-level-alternation.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/pattern/usefulness/top-level-alternation.rs) to ensure the unreachable pattern lint visits patterns inside `let else`. Added by 5b95df4 (rust-lang#87688): * [`ui/let-else/let-else-bool-binop-init.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-bool-binop-init.rs) to ensure that no lazy boolean expressions (using `&&` or `||`) are allowed in the expression, as the RFC mandates. * [`ui/let-else/let-else-brace-before-else.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-brace-before-else.rs) to ensure that no `}` directly preceding the `else` is allowed in the expression, as the RFC mandates. * [`ui/let-else/let-else-check.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-check.rs) to ensure that `#[allow(...)]` attributes added to the entire `let` statement apply for the `else` block. * [`ui/let-else/let-else-irrefutable.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-irrefutable.rs) to ensure that the `irrefutable_let_patterns` lint fires. * [`ui/let-else/let-else-missing-semicolon.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-missing-semicolon.rs) to ensure the presence of semicolons at the end of the `let` statement. * [`ui/let-else/let-else-non-diverging.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-non-diverging.rs) to ensure the `else` block diverges. * [`ui/let-else/let-else-run-pass.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-run-pass.rs) to ensure the feature works in some simple test case settings. * [`ui/let-else/let-else-scope.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-scope.rs) to ensure the bindings created by the outer `let` expression are not available in the `else` block of it. Added by bf7c32a (rust-lang#89965): * [`ui/let-else/issue-89960.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/issue-89960.rs) as a regression test for the ICE-on-error bug rust-lang#89960 . Later in 102b912 this got removed in favour of more comprehensive tests. Added by 8565419 (rust-lang#89974): * [`ui/let-else/let-else-if.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-if.rs) to test for the improved error message that points out that `let else if` is not possible. Added by 9b45713: * [`ui/let-else/let-else-allow-unused.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-allow-unused.rs) as a regression test for rust-lang#89807, to ensure that `#[allow(...)]` attributes added to the entire `let` statement apply for bindings created by the `let else` pattern. Added by 61bcd8d (rust-lang#89841): * [`ui/let-else/let-else-non-copy.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-non-copy.rs) to ensure that a copy is performed out of non-copy wrapper types. This mirrors `if let` behaviour. The test case bases on rustc internal changes originally meant for rust-lang#89933 but then removed from the PR due to the error prior to the improvements of rust-lang#89841. * [`ui/let-else/let-else-source-expr-nomove-pass.rs `](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-source-expr-nomove-pass.rs) to ensure that while there is a move of the binding in the successful case, the `else` case can still access the non-matching value. This mirrors `if let` behaviour. Added by 102b912 (rust-lang#89841): * [`ui/let-else/let-else-ref-bindings.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-ref-bindings.rs) and [`ui/let-else/let-else-ref-bindings-pass.rs `](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-ref-bindings-pass.rs) to check `ref` and `ref mut` keywords in the pattern work correctly and error when needed. Added by 2715c5f (rust-lang#89841): * Match ergonomic tests adapted from the `rfc2005` test suite. Added by fec8a50 (rust-lang#89841): * [`ui/let-else/let-else-deref-coercion-annotated.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-deref-coercion-annotated.rs) and [`ui/let-else/let-else-deref-coercion.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-deref-coercion.rs) to check deref coercions. #### Added since this stabilization report was originally written (2022-02-09) Added by 76ea566 (rust-lang#94211): * [`ui/let-else/let-else-destructuring.rs`](https://github.com/rust-lang/rust/blob/1.63.0/src/test/ui/let-else/let-else-destructuring.rs) to give a nice error message if an user tries to do an assignment with a (possibly refutable) pattern and an `else` block, like asked for in rust-lang#93995. Added by e7730dc (rust-lang#94208): * [`ui/let-else/let-else-allow-in-expr.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-allow-in-expr.rs) to test whether `#[allow(unused_variables)]` works in the expr, as well as its non presence, as well as putting it on the entire `let else` *affects* the expr, too. This was adding a missing test as pointed out by the stabilization report. * Expansion of `ui/let-else/let-else-allow-unused.rs` and `ui/let-else/let-else-check.rs` to ensure that non-presence of `#[allow(unused)]` does issue the unused lint. This was adding a missing test case as pointed out by the stabilization report. Added by 5bd7106 (rust-lang#94208): * [`ui/let-else/let-else-slicing-error.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-slicing-error.rs), a regression test for rust-lang#92069, which got fixed without addition of a regression test. This resolves a missing test as pointed out by the stabilization report. Added by 5374688 (rust-lang#98574): * [`src/test/ui/async-await/async-await-let-else.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/async-await/async-await-let-else.rs) to test the interaction of async/await with `let else` Added by 6c529de (rust-lang#98574): * [`src/test/ui/let-else/let-else-temporary-lifetime.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-temporary-lifetime.rs) as a (partial) regression test for rust-lang#98672 Added by 9b56640 (rust-lang#99518): * [`src/test/ui/let-else/let-else-temp-borrowck.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-temporary-lifetime.rs) as a regression test for rust-lang#93951 * Extension of `src/test/ui/let-else/let-else-temporary-lifetime.rs` to include a partial regression test for rust-lang#98672 (especially regarding `else` drop order) Added by baf9a7c (rust-lang#99518): * Extension of `src/test/ui/let-else/let-else-temporary-lifetime.rs` to include a partial regression test for rust-lang#93951, similar to `let-else-temp-borrowck.rs` Added by 60be2de (rust-lang#99518): * Extension of `src/test/ui/let-else/let-else-temporary-lifetime.rs` to include a program that can now be compiled thanks to borrow checker implications of rust-lang#99518 Added by 47a7a91 (rust-lang#100132): * [`src/test/ui/let-else/issue-100103.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/issue-100103.rs), as a regression test for rust-lang#100103, to ensure that there is no ICE when doing `Err(...)?` inside else blocks. Added by e3c5bd6 (rust-lang#100443): * [`src/test/ui/let-else/let-else-then-diverge.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-then-diverge.rs), to verify that there is no unreachable code error with the current desugaring. Added by 9818526 (rust-lang#100443): * [`src/test/ui/let-else/issue-94176.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/issue-94176.rs), to make sure that a correct span is emitted for a missing trailing expression error. Regression test for rust-lang#94176. Added by e182d12 (rust-lang#100434): * [src/test/ui/unpretty/pretty-let-else.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/unpretty/pretty-let-else.rs), as a regression test to ensure pretty printing works for `let else` (this bug surfaced in many different ways) Added by e262856 (rust-lang#99954): * [`src/test/ui/let-else/let-else-temporary-lifetime.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-temporary-lifetime.rs) extended to contain & borrows as well, as this was identified as an earlier issue with the desugaring: rust-lang#98672 (comment) Added by 2d8460e (rust-lang#99291): * [`src/test/ui/let-else/let-else-drop-order.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-drop-order.rs) a matrix based test for various drop order behaviour of `let else`. Especially, it verifies equality of `let` and `let else` drop orders, [resolving](rust-lang#93628 (comment)) a [stabilization blocker](rust-lang#93628 (comment)). Added by 1b87ce0 (rust-lang#101410): * Edit to `src/test/ui/let-else/let-else-temporary-lifetime.rs` to add the `-Zvalidate-mir` flag, as a regression test for rust-lang#99228 Added by af591eb (rust-lang#101410): * [`src/test/ui/let-else/issue-99975.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/issue-99975.rs) as a regression test for the ICE rust-lang#99975. Added by this PR: * `ui/let-else/let-else.rs`, a simple run-pass check, similar to `ui/let-else/let-else-run-pass.rs`. ### Things not currently tested * ~~The `#[allow(...)]` tests check whether allow works, but they don't check whether the non-presence of allow causes a lint to fire.~~ → *test added by e7730dc* * ~~There is no `#[allow(...)]` test for the expression, as there are tests for the pattern and the else block.~~ → *test added by e7730dc* * ~~`let-else-brace-before-else.rs` forbids the `let ... = {} else {}` pattern and there is a rustfix to obtain `let ... = ({}) else {}`. I'm not sure whether the `.fixed` files are checked by the tooling that they compile. But if there is no such check, it would be neat to make sure that `let ... = ({}) else {}` compiles.~~ → *test added by e7730dc* * ~~rust-lang#92069 got closed as fixed, but no regression test was added. Not sure it's worth to add one.~~ → *test added by 5bd7106* * ~~consistency between `let else` and `if let` regarding lifetimes and drop order: rust-lang#93628 (comment) → *test added by 2d8460e* Edit: they are all tested now. ### Possible future work / Refutable destructuring assignments [RFC 2909](https://rust-lang.github.io/rfcs/2909-destructuring-assignment.html) specifies destructuring assignment, allowing statements like `FooBar { a, b, c } = foo();`. As it was stabilized, destructuring assignment only allows *irrefutable* patterns, which before the advent of `let else` were the only patterns that `let` supported. So the combination of `let else` and destructuring assignments gives reason to think about extensions of the destructuring assignments feature that allow refutable patterns, discussed in rust-lang#93995. A naive mapping of `let else` to destructuring assignments in the form of `Some(v) = foo() else { ... };` might not be the ideal way. `let else` needs a diverging `else` clause as it introduces new bindings, while assignments have a default behaviour to fall back to if the pattern does not match, in the form of not performing the assignment. Thus, there is no good case to require divergence, or even an `else` clause at all, beyond the need for having *some* introducer syntax so that it is clear to readers that the assignment is not a given (enums and structs look similar). There are better candidates for introducer syntax however than an empty `else {}` clause, like `maybe` which could be added as a keyword on an edition boundary: ```Rust let mut v = 0; maybe Some(v) = foo(&v); maybe Some(v) = foo(&v) else { bar() }; ``` Further design discussion is left to an RFC, or the linked issue.

rust-highfive assigned michaelwoerister Oct 16, 2021

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 16, 2021

est31 mentioned this pull request Oct 16, 2021

Tracking Issue for RFC 3137: let-else statements #87335

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compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs Show resolved Hide resolved

est31 force-pushed the let_else branch from 17797d5 to 19cab08 Compare October 16, 2021 03:40

est31 added 2 commits October 16, 2021 07:18

Adopt let_else across the compiler

1418df5

This performs a substitution of code following the pattern: let <id> = if let <pat> = ... { identity } else { ... : ! }; To simplify it to: let <pat> = ... { identity } else { ... : ! }; By adopting the let_else feature.

est31 force-pushed the let_else branch from 19cab08 to ef018be Compare October 16, 2021 05:19

rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Oct 16, 2021

michaelwoerister approved these changes Oct 18, 2021

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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 Oct 18, 2021

bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 19, 2021

nbdd0121 mentioned this pull request Oct 20, 2021

Closure capture cleanup & refactor #89861

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This was referenced Nov 18, 2021

ICE with let_else: trimmed_def_paths constructed #91017

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Adopt let_else in more places in rustc_mir_build #91018

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matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Nov 20, 2021

Rollup merge of rust-lang#91018 - est31:let_else, r=matthewjasper

770f0b2

Adopt let_else in more places in rustc_mir_build Helps avoid rightward drift. followup of rust-lang#89933

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Nov 20, 2021

Rollup merge of rust-lang#91018 - est31:let_else, r=matthewjasper

f37a6ca

Adopt let_else in more places in rustc_mir_build Helps avoid rightward drift. followup of rust-lang#89933

est31 mentioned this pull request Dec 3, 2021

Use let_else in some more places in rustc_lint #91481

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est31 mentioned this pull request Jan 18, 2022

Use let_else in even more places #93046

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matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Jan 21, 2022

Rollup merge of rust-lang#93046 - est31:let_else, r=davidtwco

ab19d4a

Use let_else in even more places Followup of rust-lang#89933, rust-lang#91018, rust-lang#91481.

est31 mentioned this pull request Feb 2, 2022

More let_else adoptions #93590

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matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Feb 2, 2022

Rollup merge of rust-lang#93590 - est31:let_else, r=lcnr

3388e6d

More let_else adoptions Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046.

This was referenced Feb 9, 2022

Stabilize let else #93628

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Even more let_else adoptions #94011

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matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Feb 17, 2022

Rollup merge of rust-lang#94011 - est31:let_else, r=lcnr

637d8b8

Even more let_else adoptions Continuation of rust-lang#89933, rust-lang#91018, rust-lang#91481, rust-lang#93046, rust-lang#93590.

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Adopt let_else across the compiler #89933

Adopt let_else across the compiler #89933

est31 commented Oct 16, 2021 •

edited

rust-highfive commented Oct 16, 2021

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est31 commented Oct 16, 2021

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rust-timer commented Oct 16, 2021

rust-timer commented Oct 16, 2021

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michaelwoerister commented Oct 18, 2021

bors commented Oct 18, 2021

bors commented Oct 19, 2021

bors commented Oct 19, 2021

rust-timer commented Oct 19, 2021

est31 commented Oct 19, 2021

Adopt let_else across the compiler #89933

Adopt let_else across the compiler #89933

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est31 commented Oct 16, 2021 • edited

rust-highfive commented Oct 16, 2021

Mark-Simulacrum commented Oct 16, 2021

rust-timer commented Oct 16, 2021

bors commented Oct 16, 2021

est31 commented Oct 16, 2021

bors commented Oct 16, 2021

bors commented Oct 16, 2021

rust-timer commented Oct 16, 2021

rust-timer commented Oct 16, 2021

joshtriplett commented Oct 16, 2021

michaelwoerister commented Oct 18, 2021

bors commented Oct 18, 2021

bors commented Oct 19, 2021

bors commented Oct 19, 2021

rust-timer commented Oct 19, 2021

est31 commented Oct 19, 2021

est31 commented Oct 16, 2021 •

edited