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warning: field `0` is never read --> test_suite/tests/regression/issue2846.rs:8:45 | 8 | pub struct S(#[serde(with = $with)] i32); | - field in this struct ^^^ ... 12 | declare_in_macro!("with"); | ------------------------- in this macro invocation | = help: consider removing this field = note: `#[warn(dead_code)]` on by default = note: this warning originates in the macro `declare_in_macro` (in Nightly builds, run with -Z macro-backtrace for more info)