Error code E0551

An invalid meta-item was used inside an attribute.

Erroneous code example:

#[deprecated(note)] // error!
fn i_am_deprecated() {}
Run

Meta items are the key-value pairs inside of an attribute. To fix this issue, you need to give a value to the note key. Example:

#[deprecated(note = "because")] // ok!
fn i_am_deprecated() {}
Run

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