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rustc should warn about unused traits. #41883

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rustc should warn about unused traits.#41883
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A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.C-enhancementCategory: An issue proposing an enhancement or a PR with one.T-langRelevant to the language team

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@ehiggs
ehiggs
opened on May 10, 2017
trait A{}

fn main() {}

This won't yield a compiler warning. However the equivalent with a struct will:

struct A{}

fn main() {}

https://play.rust-lang.org/?gist=0787e43a11bb28969e9f4978954c3fdc

rustc 1.19.0-nightly (d3abc80 2017-05-09)

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    A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.C-enhancementCategory: An issue proposing an enhancement or a PR with one.T-langRelevant to the language team

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