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            Rollup of 4 pull requests #124633
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    "is greater or equal to". Beside common sense.
library/backtrace also declares a feature called `gimli-symbolize` which appear used, but the feature in std with the same name is unused, so remove it.
this directive prevents compiletest from adding any implicit and automatic --check-cfg arguments
…youxu
Enable `--check-cfg` by default in UI tests
This PR enables-by-default `--check-cfg` in UI tests, now that it has become stable.
To do so this PR does 2 main things:
 - it introduce the `no-auto-check-cfg` directive to `compiletest`, to prevent any `--check-cfg` args (only to be used for `--check-cfg` tests)
 - it updates the _remaining_[^1] UI tests by either:
     - allowing the lint when neither expecting the lint nor giving the check-cfg args make sense
     - give the appropriate check-cfg args
     - or expect the lint, when it useful
[^1]: some preparation work was done in rust-lang#123577 rust-lang#123702
I highly recommend reviewing this PR commit-by-commit.
r? `@jieyouxu`
    io safety: update Unix explanation to use `Arc` Fixes rust-lang#124384 Cc ``@jsgf``
…s, r=Amanieu String.truncate comment microfix (greater or equal) String.truncate calls Vec.truncate, in turn, and that states "is greater or equal to". Beside common sense.
…kingjubilee library/std: Remove unused `gimli-symbolize` feature library/backtrace also declares a feature called `gimli-symbolize` which appear used, but the feature in std with the same name is unused, so remove it.
| @bors r+ rollup=never p=6 | 
    
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…iaskrgr Rollup of 4 pull requests Successful merges: - rust-lang#124345 (Enable `--check-cfg` by default in UI tests) - rust-lang#124412 (io safety: update Unix explanation to use `Arc`) - rust-lang#124441 (String.truncate comment microfix (greater or equal)) - rust-lang#124604 (library/std: Remove unused `gimli-symbolize` feature) Failed merges: - rust-lang#124607 (`rustc_expand` cleanups) - rust-lang#124613 (Allow fmt to run on rmake.rs test files) r? `@ghost` `@rustbot` modify labels: rollup
    
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…iaskrgr Rollup of 4 pull requests Successful merges: - rust-lang#124345 (Enable `--check-cfg` by default in UI tests) - rust-lang#124412 (io safety: update Unix explanation to use `Arc`) - rust-lang#124441 (String.truncate comment microfix (greater or equal)) - rust-lang#124604 (library/std: Remove unused `gimli-symbolize` feature) Failed merges: - rust-lang#124607 (`rustc_expand` cleanups) - rust-lang#124613 (Allow fmt to run on rmake.rs test files) r? `@ghost` `@rustbot` modify labels: rollup
| The job  Click to see the possible cause of the failure (guessed by this bot) | 
| 💔 Test failed - checks-actions | 
  
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      Labels
      
    A-testsuite
  Area: The testsuite used to check the correctness of rustc 
  
    O-unix
  Operating system: Unix-like 
  
    rollup
  A PR which is a rollup 
  
    S-waiting-on-review
  Status: Awaiting review from the assignee but also interested parties. 
  
    T-bootstrap
  Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) 
  
    T-compiler
  Relevant to the compiler team, which will review and decide on the PR/issue. 
  
    T-libs
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    T-rustdoc
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Successful merges:
--check-cfgby default in UI tests #124345 (Enable--check-cfgby default in UI tests)Arc#124412 (io safety: update Unix explanation to useArc)gimli-symbolizefeature #124604 (library/std: Remove unusedgimli-symbolizefeature)Failed merges:
rustc_expandcleanups #124607 (rustc_expandcleanups)r? @ghost
@rustbot modify labels: rollup
Create a similar rollup