Make `missing_fragment_specifier` an unconditional error #128425

tgross35 · 2024-07-31T03:45:47Z

This was attempted in 1 then reverted in 2 because of fallout. Recently, this was made an edition-dependent error in 3.

Make missing fragment specifiers an unconditional error again, across all editions.

More context: #128006
Most recent crater: #128425 (comment)
Fixes: #40107

r? @petrochenkov

tgross35 · 2024-07-31T07:31:07Z

This is just to test the diagnostics, none of the possible code cleanup is included.

@petrochenkov please take a look when you get the chance and start crater if the change seems correct.

@bors try

…unconditional, r=<try> [crater] Make `missing_fragment_specifier` an unconditional error This was attempted in [1] then reverted in [2] because of fallout. Recently, this was made an edition-dependent error in [3]. Experiment with turning missing fragment specifiers an unconditional error again. More context: rust-lang#128006 [1]: rust-lang#75516 [2]: rust-lang#80210 [3]: rust-lang#128006

bors · 2024-07-31T07:32:19Z

⌛ Trying commit c2492ec with merge 063c08d...

bors · 2024-07-31T09:13:42Z

☀️ Try build successful - checks-actions
Build commit: 063c08d (063c08dd8db6ff113bb809c130456f1781abe72c)

petrochenkov · 2024-07-31T12:54:34Z

@craterbot check

craterbot · 2024-07-31T12:54:42Z

👌 Experiment pr-128425 created and queued.
🤖 Automatically detected try build 063c08d
🔍 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

craterbot · 2024-08-09T12:35:40Z

🚧 Experiment pr-128425 is now running

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

craterbot · 2024-08-11T15:07:21Z

🎉 Experiment pr-128425 is completed!
📊 156 regressed and 2 fixed (487733 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

tgross35 · 2024-08-14T06:03:30Z

rg 'missing fragment specifier' -l --stats in the logs reports 373 matches. The previous attempt in 2020 had 475 regressions per #76605, so that is slight improvement but not much.

Like the previous run, almost all of these (361) come from clap <= 2.20, based on a crude rg 'missing fragment specifier.*\n.*clap' -l --stats -U. Remaining 12:

build-fail/reg/sem/0.1.0/master#83dcdb3a5dad0ed1e3e1fadc848d3f7727b41aa5.txt-[INFO] [stdout]    --> src/macros.rs:121:17
build-fail/reg/sem/0.1.0/master#83dcdb3a5dad0ed1e3e1fadc848d3f7727b41aa5.txt-[INFO] [stdout]    --> src/macros.rs:136:17
build-fail/reg/sem/0.1.0/master#83dcdb3a5dad0ed1e3e1fadc848d3f7727b41aa5.txt-[INFO] [stdout]    --> src/macros.rs:121:17
build-fail/reg/sem/0.1.0/master#83dcdb3a5dad0ed1e3e1fadc848d3f7727b41aa5.txt-[INFO] [stdout]    --> src/macros.rs:136:17
build-fail/reg/sem/0.1.0/try#063c08dd8db6ff113bb809c130456f1781abe72c.txt-[INFO] [stdout]    --> src/macros.rs:121:17
build-fail/reg/sem/0.1.0/try#063c08dd8db6ff113bb809c130456f1781abe72c.txt-[INFO] [stdout]    --> src/macros.rs:136:17
build-fail/reg/sem/0.1.0/try#063c08dd8db6ff113bb809c130456f1781abe72c.txt-[INFO] [stdout]    --> src/macros.rs:121:17
build-fail/reg/sem/0.1.0/try#063c08dd8db6ff113bb809c130456f1781abe72c.txt-[INFO] [stdout]    --> src/macros.rs:136:17
build-fail/reg/sem/0.1.0/try#063c08dd8db6ff113bb809c130456f1781abe72c.txt-[INFO] [stdout]    --> src/macros.rs:121:17
build-fail/reg/sem/0.1.0/try#063c08dd8db6ff113bb809c130456f1781abe72c.txt-[INFO] [stdout]    --> src/macros.rs:121:17
build-fail/reg/sem/0.1.0/try#063c08dd8db6ff113bb809c130456f1781abe72c.txt-[INFO] [stdout]    --> src/macros.rs:136:17
build-fail/reg/sem/0.1.0/try#063c08dd8db6ff113bb809c130456f1781abe72c.txt-[INFO] [stdout]    --> src/macros.rs:136:17

We could let this simmer for a while with the new error in deps level (#128122) and/or the edition-dependent lint (#128006). I don't really know how to feel about these results because all of the relevant clap versions have been yanked for ~4 years, per clap-rs/clap#2076.

Requesting compiler feedback for how to proceed. Context: this was made an e2024 error in #128006, making it an error in all editions is being considered here.

@rustbot label +I-compiler-nominated

wesleywiser · 2024-08-15T14:58:09Z

Discussed briefly in the compiler team triage meeting. Given that nearly all regressions are on very old versions of clap and this has been a compatibility warning since 2017, we think it's reasonable to make this an unconditional error.

tgross35 · 2024-08-18T01:06:30Z

Thanks for discussing this. I'll wait for the next beta branch so #128122 is on stable for at least a cycle, then continue pushing this forward.

tgross35 · 2024-08-19T11:15:34Z

To reflect my above comment

@rustbot blocked

petrochenkov · 2025-06-10T12:00:38Z

There's a list of removed lints in compiler\rustc_lint\src\lib.rs.
r=me after adding missing_fragment_specifier to that list (formally approved in #128425 (comment)).
@rustbot author

tgross35 · 2025-06-10T18:18:21Z

Added to the removed lint list https://github.com/rust-lang/rust/compare/59997821a886ca515ff17af950dbf4498f8975bf..1dc388b13663eb64cca8cbe76ee97c00985e3d91

@bors r=petrochenkov,traviscross

bors · 2025-06-10T18:18:24Z

📌 Commit 1dc388b has been approved by petrochenkov,traviscross

It is now in the queue for this repository.

…r-unconditional, r=petrochenkov,traviscross Make `missing_fragment_specifier` an unconditional error This was attempted in [1] then reverted in [2] because of fallout. Recently, this was made an edition-dependent error in [3]. Make missing fragment specifiers an unconditional error again, across all editions. More context: rust-lang#128006 Most recent crater: rust-lang#128425 (comment) Fixes: rust-lang#40107 [1]: rust-lang#75516 [2]: rust-lang#80210 [3]: rust-lang#128006

Rollup of 13 pull requests Successful merges: - #128425 (Make `missing_fragment_specifier` an unconditional error) - #141639 (Expose discriminant values in stable_mir) - #141967 (Configure bootstrap backport nominations through triagebot) - #142042 (Make E0621 missing lifetime suggestion verbose) - #142176 (tests: Split dont-shuffle-bswaps along opt-levels and arches) - #142235 (Build rustc with assertions in `dist-alt` jobs) - #142248 (Add supported asm types for LoongArch32) - #142272 (tests: Change ABIs in tests to more future-resilient ones) - #142282 (Only run `citool` tests on the `auto` branch) - #142285 (tests: Do not run afoul of asm.validity.non-exhaustive in input-stats) - #142297 (Implement `//@ needs-target-std` compiletest directive) - #142298 (Make loongarch-none target maintainers more easily pingable) - #142306 (Dont unwrap and re-wrap typing envs) Failed merges: - #141942 (Implement representation options to smir) r? `@ghost` `@rustbot` modify labels: rollup

…r-unconditional, r=petrochenkov,traviscross Make `missing_fragment_specifier` an unconditional error This was attempted in [1] then reverted in [2] because of fallout. Recently, this was made an edition-dependent error in [3]. Make missing fragment specifiers an unconditional error again, across all editions. More context: rust-lang#128006 Most recent crater: rust-lang#128425 (comment) Fixes: rust-lang#40107 [1]: rust-lang#75516 [2]: rust-lang#80210 [3]: rust-lang#128006

bors · 2025-06-12T07:24:52Z

☔ The latest upstream changes (presumably #142392) made this pull request unmergeable. Please resolve the merge conflicts.

This was attempted in [1] then reverted in [2] because of fallout. Recently, this was made an edition-dependent error in [3]. Make missing fragment specifiers an unconditional error again. [1]: rust-lang#75516 [2]: rust-lang#80210 [3]: rust-lang#128006

tgross35 · 2025-06-12T07:57:42Z

Resolved conflicts.

@bors r=petrochenkov,traviscross

bors · 2025-06-12T07:57:44Z

📌 Commit 841f7ce has been approved by petrochenkov,traviscross

It is now in the queue for this repository.

rustbot assigned petrochenkov Jul 31, 2024

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tgross35 force-pushed the missing-fragment-specifier-unconditional branch 2 times, most recently from 392a2c7 to c2492ec Compare July 31, 2024 06:14

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Tracking issue for future-incompatibility lint missing_fragment_specifier #40107

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Make missing_fragment_specifier an error in edition 2024 #128006

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missing_fragment_specifier points at the wrong span if followed by another metavariable #129077

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Rollup of 13 pull requests #142313

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Rollup of 17 pull requests #142332

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Fix a missing fragment specifier in rustdoc tests

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tgross35 force-pushed the missing-fragment-specifier-unconditional branch from 1dc388b to 1928f93 Compare June 12, 2025 07:47

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Make missing_fragment_specifier an unconditional error #128425

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Make `missing_fragment_specifier` an unconditional error #128425

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