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2018 lints: false positive: "extern crate is not idiomatic" #52479

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matthiaskrgr opened this issue Jul 18, 2018 · 1 comment
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2018 lints: false positive: "extern crate is not idiomatic" #52479

matthiaskrgr opened this issue Jul 18, 2018 · 1 comment
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A-edition-2018 Area: The 2018 edition A-lints Area: Lints (warnings about flaws in source code) such as unused_mut.
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Rust 2018 Preview 2

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@matthiaskrgr
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matthiaskrgr commented Jul 18, 2018 •
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git clone http://github.com/matthiaskrgr/cargo-rebuild-check
cd cargo-rebuild-check/
git checkout origin/rust_2018
cargo test

=>

   Compiling cargo-rebuild-check v0.1.0 (file:///tmp/cargo-rebuild-check)
warning: `extern crate` is not idiomatic in the new edition========> ] 134/135: cargo-rebuild-check
  |
note: lint level defined here
 --> src/main.rs:11:5
  |
11|     unused
  |     ^^^^^^
  = note: #[warn(unused_extern_crates)] implied by #[warn(unused)]
    Finished dev [unoptimized + debuginfo] target(s) in 1m 24s
     Running target/debug/deps/cargo_rebuild_check-49c258c37ade7bcc

I'm not sure what rustc is complaining about.
There simply is no "extern crate" inside the project at this point :/
It also fails to point me to the code location which is suspicious.

rustc 1.29.0-nightly (4f3c7a4 2018-07-17)
@alexcrichton alexcrichton mentioned this issue Jul 18, 2018
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@alexcrichton
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I've confirmed this is fixed by #52467

@alexcrichton alexcrichton added this to the Rust 2018 Preview 2 milestone Jul 18, 2018
bors added a commit that referenced this issue Jul 20, 2018
@bors
Auto merge of #52467 - alexcrichton:lints-and-macros, r=Manishearth
4260c8b 
Squash all lints tied to foreign macros by default

This PR is a continuation of #49755 (thanks for the initial jump-start @Dylan-DPC!) and is targeted at solving #48855. This change updates the lint infrastructure to, by default, ignore all lints emitted for code that originates in a foreign macro. For example if `println!("...")` injects some idiomatic warnings these are all ignored by default. The rationale here is that for almost all lints there's no action that can be taken if the code originates from a foreign lint.

Closes #48855
Closes #52483
Closes #52479
@fmease fmease added A-edition-2018 Area: The 2018 edition A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. and removed A-edition-2018-lints labels Dec 21, 2024
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