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Spurious dead_code warning when type is only used in path #23808

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Spurious dead_code warning when type is only used in path#23808
Labels
A-diagnosticsArea: Messages for errors, warnings, and lintsA-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.L-dead_codeLint: dead_codeT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

Description

@apasel422
apasel422
opened on Mar 28, 2015

foo.rs:

trait Bar {
    fn bar() {}
}

enum Foo {}

impl Bar for Foo {}

fn main() {
    Foo::bar();
}

Warning:

> rustc --version
rustc 1.0.0-nightly (199bdcfef 2015-03-26) (built 2015-03-27)
> rustc foo.rs 
foo.rs:5:1: 5:12 warning: enum is never used: `Foo`, #[warn(dead_code)] on by default
foo.rs:5 enum Foo {}
         ^~~~~~~~~~~

Activity

  1. jdm
    added
    I-wrong
    A-diagnosticsArea: Messages for errors, warnings, and lints
    on Mar 28, 2015

  2. TimNN commented on Aug 5, 2015

    @TimNN
    TimNN
    on Aug 5, 2015
    Contributor

    By the way, the warning goes away if you explicitly specify the trait who's static method you are calling, like so:

    <Foo as Bar>::bar();
  3. bors
    closed this as completedin #27565on Aug 22, 2015
  4. jieyouxu
    added
    A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.
    T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
    L-dead_codeLint: dead_code
    on Apr 18, 2025
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    A-diagnosticsArea: Messages for errors, warnings, and lintsA-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.L-dead_codeLint: dead_codeT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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