[CRATER RUN DO NOT MERGE] crater run to evaluate effectiveness of lint for if_let_rescope #129466

dingxiangfei2009 · 2024-08-23T11:37:21Z

Tracked by #124085
Related to #107251
cc @jieyouxu for review context
cc @traviscross for edition tracking

There is one unresolved issue that cargo fix --edition does not emit if-let-rescope lint. Details in rust-lang/cargo#14447.

Note that this patch is assuming that the feature gate if_let_rescope is always on just for this crater run.

rustbot · 2024-08-23T11:37:28Z

r? @lcnr

rustbot has assigned @lcnr.
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rustbot · 2024-08-23T11:37:29Z

⚠️ Warning ⚠️

These commits modify submodules.

dingxiangfei2009 · 2024-08-23T11:40:11Z

r? @jieyouxu

Maybe cc or r ? @ehuss if more appropriate

jieyouxu · 2024-08-23T11:48:19Z

.gitmodules

@@ -4,7 +4,7 @@
 	shallow = true
 [submodule "src/tools/cargo"]
 	path = src/tools/cargo
-	url = https://github.com/rust-lang/cargo.git
+	url = https://github.com/dingxiangfei2009/cargo.git


Question: maybe this also needs to be on a separate branch?

jieyouxu · 2024-08-23T12:07:33Z

We can inject crate-level attrs thanks to #52355:

rustc -Z unstable-options -Z crate-attr='feature(if_let_rescope)'

This would satisfy one of the conditions for lint emission, which is the feature-gate. ~~If we also do the Cargo.toml edition = 2021 -> edition = 2024 rewrite, then I think that would satisfy both conditions.~~

EDIT: this is a migration lint, it cannot only fire on Edition 2024.

jieyouxu · 2024-08-23T12:15:32Z

But I'm not sure about cargo fix --edition not applying the migration lint fixes in the migration pass, so we'll want a cargo expert to help us take a look.

jieyouxu · 2024-08-23T12:28:19Z

@rustbot blocked (on figuring out why cargo fix --edition doesn't apply the migration lint)

ehuss

The cargo submodule change has some extra changes to it which I would not recommend including. I would suggest just cherry-picking commit b2608729b3ef3540a8020a06a3503eff9d0dbdd2 from my fork (applied to a branch from the current submodule's commit).

compiler/rustc_lint/src/if_let_rescope.rs

dingxiangfei2009 · 2024-08-25T14:52:52Z

Looks like it is working locally.

Shall we give it a crater run? Just check is okay.

cc @jieyouxu

jieyouxu · 2024-08-25T15:00:05Z

Looks like it is working locally.

We could, but it has to build on the try-job.

@bors try

bors · 2024-08-25T15:01:17Z

⌛ Trying commit 6aa732a with merge c469850...

…er-run, r=<try> [CRATER RUN DO NOT MERGE] Let chain lint crater run Tracked by rust-lang#124085 Related to rust-lang#107251 cc `@jieyouxu` for review context cc `@traviscross` for edition tracking There is one unresolved issue that `cargo fix --edition` does not emit `if-let-rescope` lint. Details in rust-lang/cargo#14447. Note that this patch is assuming that the feature gate `if_let_rescope` is always on just for this crater run.

ehuss · 2024-09-17T19:27:00Z

@dingxiangfei2009, it looks like your cargo branch is outdated. You'll probably need to rebase it on latest master of the cargo repo.

(In general, using the tip of master of rust-lang/cargo means you are using things that haven't landed in rust-lang/rust, yet, which may lead to problems. Using the SHA of the submodule in rust-lang/rust's cargo submodule as your base can avoid that, but is more awkward to do.)

bors · 2024-09-17T21:05:36Z

💔 Test failed - checks-actions

dingxiangfei2009 · 2024-09-17T22:04:10Z

@ehuss Thanks for the tip! I rebased this onto the new master and cherry-picked the commit into the cargo submodule. I am going to give it a try again.

dingxiangfei2009 · 2024-09-17T22:04:34Z

@bors try

bors · 2024-09-17T22:05:45Z

⌛ Trying commit 81fac33 with merge ccf408f...

…er-run, r=<try> [CRATER RUN DO NOT MERGE] Let chain lint crater run Tracked by rust-lang#124085 Related to rust-lang#107251 cc `@jieyouxu` for review context cc `@traviscross` for edition tracking There is one unresolved issue that `cargo fix --edition` does not emit `if-let-rescope` lint. Details in rust-lang/cargo#14447. Note that this patch is assuming that the feature gate `if_let_rescope` is always on just for this crater run.

rust-log-analyzer · 2024-09-17T22:20:19Z

The job x86_64-gnu-llvm-17 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

------
 > importing cache manifest from ghcr.io/rust-lang/rust-ci-cache:fb97a1d6377f6cf2227825318ca4bbde3889e0c420746f5a03ba46a07e9a862725c26a09b9fc49a0d129ebd75935d3f6cd19acf41cc4267a6846fd4aa574b12c:
------
##[endgroup]
Setting extra environment values for docker:  --env ENABLE_GCC_CODEGEN=1 --env GCC_EXEC_PREFIX=/usr/lib/gcc/
[CI_JOB_NAME=x86_64-gnu-llvm-17]
---
sccache: Starting the server...
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--build=x86_64-unknown-linux-gnu', '--llvm-root=/usr/lib/llvm-17', '--enable-llvm-link-shared', '--set', 'rust.randomize-layout=true', '--set', 'rust.thin-lto-import-instr-limit=10', '--set', 'change-id=99999999', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--set', 'rust.lld=false', '--disable-dist-src', '--release-channel=nightly', '--enable-debug-assertions', '--enable-overflow-checks', '--enable-llvm-assertions', '--set', 'rust.verify-llvm-ir', '--set', 'rust.codegen-backends=llvm,cranelift,gcc', '--set', 'llvm.static-libstdcpp', '--enable-new-symbol-mangling']
configure: target.x86_64-unknown-linux-gnu.llvm-config := /usr/lib/llvm-17/bin/llvm-config
configure: llvm.link-shared     := True
configure: rust.randomize-layout := True
configure: rust.thin-lto-import-instr-limit := 10
---

6    |                                       |
7    |                                       creates a temporary value which is freed while still in use
8    |
- note: lifetime for temporaries generated in `if let`s have been shorted in Edition 2024
-   --> $DIR/if-let-rescope-suggestions.rs:23:65
+ note: lifetimes for temporaries generated in `if let`s have been shortened in Edition 2024 so that they are dropped here instead
11    |
11    |
12 LL |     do_something(if let Some(value) = Droppy.get_ref() { value } else { &0 });
+    |                                                                ^
14 help: consider using a `let` binding to create a longer lived value
15    |
15    |
16 LL ~     let binding = Droppy;
18    |
19 help: consider rewriting the `if` into `match` which preserves the extended lifetime
20    |
20    |
- LL |     do_something(match Droppy.get_ref()  { Some(value) => { value } _ => { &0 }});
-    |                  ~~~~~                   ++++++++++++++++           ~~~~       +
+ LL |     do_something({ match Droppy.get_ref()  { Some(value) => { value } _ => { &0 }}});
23 
24 error: aborting due to 1 previous error
25 



The actual stderr differed from the expected stderr.
Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/drop/if-let-rescope-suggestions/if-let-rescope-suggestions.stderr
diff of fixed:

21 
22 fn main() {
23     let binding = Droppy;
-     do_something(match binding.get_ref()  { Some(value) => { value } _ => { &0 }});
+     do_something({ match binding.get_ref()  { Some(value) => { value } _ => { &0 }}});
25     //~^ ERROR: temporary value dropped while borrowed
27 


The actual fixed differed from the expected fixed.
The actual fixed differed from the expected fixed.
Actual fixed saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/drop/if-let-rescope-suggestions/if-let-rescope-suggestions.fixed
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args drop/if-let-rescope-suggestions.rs`

error: 2 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/drop/if-let-rescope-suggestions.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/drop/if-let-rescope-suggestions" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/drop/if-let-rescope-suggestions/auxiliary" "--edition=2024" "-Z" "validate-mir" "-Zunstable-options"
--- stderr -------------------------------
error[E0716]: temporary value dropped while borrowed
##[error]  --> /checkout/tests/ui/drop/if-let-rescope-suggestions.rs:23:39
   |
   |
LL |     do_something(if let Some(value) = Droppy.get_ref() { value } else { &0 });
   |                                       |
   |                                       creates a temporary value which is freed while still in use
   |
   |
note: lifetimes for temporaries generated in `if let`s have been shortened in Edition 2024 so that they are dropped here instead
   |
   |
LL |     do_something(if let Some(value) = Droppy.get_ref() { value } else { &0 });
help: consider using a `let` binding to create a longer lived value
   |
   |
LL ~     let binding = Droppy;
LL ~     do_something(if let Some(value) = binding.get_ref() { value } else { &0 });
help: consider rewriting the `if` into `match` which preserves the extended lifetime
   |
   |
LL |     do_something({ match Droppy.get_ref()  { Some(value) => { value } _ => { &0 }}});

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0716`.
For more information about this error, try `rustc --explain E0716`.
------------------------------------------


---- [ui] tests/ui/drop/lint-if-let-rescope-gated.rs#without_feature_gate stdout ----

error in revision `without_feature_gate`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/drop/lint-if-let-rescope-gated.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "--cfg" "without_feature_gate" "--check-cfg" "cfg(FALSE,with_feature_gate,without_feature_gate)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/drop/lint-if-let-rescope-gated.without_feature_gate" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/drop/lint-if-let-rescope-gated.without_feature_gate/auxiliary" "--edition=2021"
--- stderr -------------------------------
error: `if let` assigns a shorter lifetime since Edition 2024
##[error]  --> /checkout/tests/ui/drop/lint-if-let-rescope-gated.rs:27:8
   |
   |
LL |     if let Some(_value) = Droppy.get() {
   |                           |
   |                           |
   |                           this value has a significant drop implementation which may observe a major change in drop order and requires your discretion
   = warning: this changes meaning in Rust 2024
   = note: for more information, see issue #124085 <https://github.com/rust-lang/rust/issues/124085>
help: the value is now dropped here in Edition 2024
  --> /checkout/tests/ui/drop/lint-if-let-rescope-gated.rs:31:5
  --> /checkout/tests/ui/drop/lint-if-let-rescope-gated.rs:31:5
   |
LL |     } else {
   |     ^
note: the lint level is defined here
  --> /checkout/tests/ui/drop/lint-if-let-rescope-gated.rs:11:9
   |
LL | #![deny(if_let_rescope)]
help: a `match` with a single arm can preserve the drop order up to Edition 2021
   |
   |
LL ~     match Droppy.get() { Some(_value) => {
LL |         //[with_feature_gate]~^ ERROR: `if let` assigns a shorter lifetime since Edition 2024
LL |         //[with_feature_gate]~| HELP: a `match` with a single arm can preserve the drop order up to Edition 2021
LL |         //[with_feature_gate]~| WARN: this changes meaning in Rust 2024
LL ~     } _ => {
LL |         //[with_feature_gate]~^ HELP: the value is now dropped here in Edition 2024
LL ~     }}

error: aborting due to 1 previous error
------------------------------------------

bors · 2024-09-17T23:52:41Z

☀️ Try build successful - checks-actions
Build commit: ccf408f (ccf408f4326a858c00dd845a64a86b16f360a801)

dingxiangfei2009 · 2024-09-18T08:34:38Z

Finally!

@jieyouxu Shall we do one more crater run? Many thanks! 🙇

jieyouxu · 2024-09-18T08:58:41Z

@craterbot run start=master#f609b7e0586f81fefb3523e3e17adf779ac416be end=try#ccf408f4326a858c00dd845a64a86b16f360a801 mode=check-only

craterbot · 2024-09-18T08:58:47Z

👌 Experiment pr-129466-2 created and queued.
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

jieyouxu · 2024-09-18T08:59:18Z

I think that incantation is correct since we hijacked cargo check to do cargo fix --edition

craterbot · 2024-09-26T11:07:27Z

🚧 Experiment pr-129466-2 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2024-09-28T23:26:04Z

🎉 Experiment pr-129466-2 is completed!
📊 3783 regressed and 38667 fixed (514738 total)
📰 Open the full report.

⚠️ If you notice any spurious failure please add them to the blacklist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

dingxiangfei2009 · 2024-09-30T13:06:33Z

We narrow down to the 3k crates in the entire ecosystem, most of which are not if let related and pertaining to other migration that is still in development.

The minority of them are false positives from while let which we don't need to lint, and a few triggering a corner case involving if lets surrounded by pairs of round brackets. rustc currently include the brackets into the span, which may or may not be reasonable, but we will handle them nicely in #131035 once it is merged. Thus, I would say we can conclude the crater run experiments and prepare for stabilization.

cc @traviscross

Open questions: what should we do about the brackets included in the span? I believe we should not, but maybe other parts of rustc depends on this contract, ie. rustfmt?

…ope-lint, r=jieyouxu Preserve brackets around if-lets and skip while-lets r? `@jieyouxu` Tracked by rust-lang#124085 Fresh out of rust-lang#129466, we have discovered 9 crates that the lint did not successfully migrate because the span of `if let` includes the surrounding brackets `(..)` like the following, which surprised me a bit. ```rust if (if let .. { .. } else { .. }) { // ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // the span somehow includes the surrounding brackets } ``` There is one crate that failed the migration because some suggestion spans cross the macro expansion boundaries. Surely there is no way to patch them with `match` rewrite. To handle this case, we will instead require all spans to be tested for admissibility as suggestion spans. Besides, there are 4 false negative cases discovered with desugared-`while let`. We don't need to lint them, because the `else` branch surely contains exactly one statement because the drop order is not changed whatsoever in this case. ```rust while let Some(value) = droppy().get() { .. } // is desugared into loop { if let Some(value) = droppy().get() { .. } else { break; // here can be nothing observable in this block } } ``` I believe this is the one and only false positive that I have found. I think we have finally nailed all the corner cases this time.

Rollup merge of rust-lang#131035 - dingxiangfei2009:tweak-if-let-rescope-lint, r=jieyouxu Preserve brackets around if-lets and skip while-lets r? `@jieyouxu` Tracked by rust-lang#124085 Fresh out of rust-lang#129466, we have discovered 9 crates that the lint did not successfully migrate because the span of `if let` includes the surrounding brackets `(..)` like the following, which surprised me a bit. ```rust if (if let .. { .. } else { .. }) { // ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // the span somehow includes the surrounding brackets } ``` There is one crate that failed the migration because some suggestion spans cross the macro expansion boundaries. Surely there is no way to patch them with `match` rewrite. To handle this case, we will instead require all spans to be tested for admissibility as suggestion spans. Besides, there are 4 false negative cases discovered with desugared-`while let`. We don't need to lint them, because the `else` branch surely contains exactly one statement because the drop order is not changed whatsoever in this case. ```rust while let Some(value) = droppy().get() { .. } // is desugared into loop { if let Some(value) = droppy().get() { .. } else { break; // here can be nothing observable in this block } } ``` I believe this is the one and only false positive that I have found. I think we have finally nailed all the corner cases this time.

rustbot assigned lcnr Aug 23, 2024

rustbot added S-waiting-on-review T-compiler labels Aug 23, 2024

rustbot assigned jieyouxu and unassigned lcnr Aug 23, 2024

jieyouxu reviewed Aug 23, 2024

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rustbot added S-blocked and removed S-waiting-on-review labels Aug 23, 2024

jieyouxu added A-edition-2024 S-experimental labels Aug 23, 2024

This was referenced Aug 23, 2024

[DO NOT MERGE] Force edition 2024 lint into action on crater rust-lang/cargo#14447

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Tracking Issue for Rust 2024: Rescope temporary lifetimes with respect to else #124085

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ehuss reviewed Aug 23, 2024

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dingxiangfei2009 force-pushed the let-chain-lint-crater-run branch from 0a7118a to 6aa732a Compare August 24, 2024 17:57

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dingxiangfei2009 force-pushed the let-chain-lint-crater-run branch from 912b738 to 81fac33 Compare September 17, 2024 21:51

bors mentioned this pull request Sep 17, 2024

tests: add repr/transparent test for aarch64 #130466

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dingxiangfei2009 changed the title ~~[CRATER RUN DO NOT MERGE] Let chain lint crater run~~ [CRATER RUN DO NOT MERGE] crater run to evaluate effectiveness of lint for if_let_rescope Sep 25, 2024

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dingxiangfei2009 mentioned this pull request Sep 29, 2024

Preserve brackets around if-lets and skip while-lets #131035

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dingxiangfei2009 mentioned this pull request Oct 2, 2024

Proposal: stabilize if_let_rescope for Edition 2024 #131154

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[CRATER RUN DO NOT MERGE] crater run to evaluate effectiveness of lint for if_let_rescope #129466

[CRATER RUN DO NOT MERGE] crater run to evaluate effectiveness of lint for if_let_rescope #129466

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