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
extern
only triggersunused_extern_crates
warning: https://godbolt.org/z/bMxP8vGE9Therefore, I think it's unnecessary to
#[allow]
the wholerust_2018_idioms
lint 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_idioms
tofuture_incompatible
, causing my program fails to compile.)