Allow only unused_extern_crates instead of the whole rust_2018_idioms lint group in serde_derive-generated code
#2026
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I found that this kind of
externonly triggersunused_extern_crateswarning: https://godbolt.org/z/bMxP8vGE9Therefore, I think it's unnecessary to
#[allow]the wholerust_2018_idiomslint group.(It's causing some problems for me since I'm also using
#[forbid(future_incompatible)], and rust-lang/rust#83213 added some of the lints inrust_2018_idiomstofuture_incompatible, causing my program fails to compile.)