Attr::has

pub fn has(string key) -> bool

use macro::{Attr};

True when the attribute has an argument named key, or a bare key.

Called on a Attr value as value.has(…).

Parameters#

Returns#

bool

See also#

• Attr: #[name(args)] on a declaration, field or variant.
• Attr::src: The attribute as written: #[name(key = "v", 2)].
• Attr::arg: Value of the key = value argument, or fallback.