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Rollup of 5 pull requests #131210
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            Rollup of 5 pull requests #131210
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    This code can sometimes witness malformed coverage attributes in builds that are going to fail, so use `span_delayed_bug` to avoid an inappropriate ICE in that case.
.gitignore files for nix This adds support for direnv and nix flakes / nix shell. I'm not sure if we should have a working nix configuration though. r? `@noratrieb`
Avoid ICE in coverage builds with bad `#[coverage(..)]` attributes This code can sometimes witness malformed coverage attributes in builds that are going to fail, so use `span_delayed_bug` to avoid an inappropriate ICE in that case. Fixes rust-lang#127880.
…y-instability-lint-for-rustc-query-impl, r=compiler-errors Handle `rustc_query_impl` cases of `rustc::potential_query_instability` lint This PR removes `#![allow(rustc::potential_query_instability)]` line from [`compiler/rustc_query_impl/src/lib.rs`](https://github.com/rust-lang/rust/blob/master/compiler/rustc_query_impl/src/lib.rs#L5) <s>and converts `FxHash{Map,Set}` types into `FxIndex{Map,Set}` to suppress lint errors</s> (was not necessary for this PR). A somewhat tracking issue: rust-lang#84447 r? `@compiler-errors`
…ekmut-pop, r=Amanieu Avoid emptiness check in `PeekMut::pop` This PR avoids an unnecessary emptiness check in `PeekMut::pop` by replacing `Option::unwrap` with `Option::unwrap_unchecked`.
…piler-errors JumpThreading: fix bitwise not on non-booleans Fixes rust-lang#131195 Alternative to rust-lang#131201
| @bors r+ rollup=never p=5 | 
| @bors r- | 
| The job  Click to see the possible cause of the failure (guessed by this bot) | 
  
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      Labels
      
    A-query-system
  Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html) 
  
    rollup
  A PR which is a rollup 
  
    S-waiting-on-author
  Status: This is awaiting some action (such as code changes or more information) from the author. 
  
    T-compiler
  Relevant to the compiler team, which will review and decide on the PR/issue. 
  
    T-libs
  Relevant to the library team, which will review and decide on the PR/issue. 
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Successful merges:
#[coverage(..)]attributes #131187 (Avoid ICE in coverage builds with bad#[coverage(..)]attributes)rustc_query_implcases ofrustc::potential_query_instabilitylint #131192 (Handlerustc_query_implcases ofrustc::potential_query_instabilitylint)PeekMut::pop#131197 (Avoid emptiness check inPeekMut::pop)r? @ghost
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