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Delete unused serde_derive #[macro_use]

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In old versions of rustc (1.15 through 1.29) it would cause a warning if
this #[macro_use] was not present.

    warning: proc macro crates and `#[no_link]` crates have no effect without `#[macro_use]`
       --> serde/src/lib.rs:340:1
        |
    340 | extern crate serde_derive;
        | ^^^^^^^^^^^^^^^^^^^^^^^^^^

These days serde_derive requires a newer compiler than that, so the
bogus warning would never occur.
This commit is contained in:
David Tolnay 2023-07-25 18:46:16 -07:00
parent 6140b6f527
commit 3260bc5896
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serde/src/lib.rs
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@ -335,8 +335,6 @@ mod std_error;
// be annoying for crates that provide handwritten impls or data formats. They
// would need to disable default features and then explicitly re-enable std.
#[cfg(feature = "serde_derive")]
#[allow(unused_imports)]
#[macro_use]
extern crate serde_derive;
/// Derive macro available if serde is built with `features = ["derive"]`.