rust/src/libsyntax/ext/proc_macro.rs

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use crate::ast::Attribute;
use crate::symbol::sym;
pub fn is_proc_macro_attr(attr: &Attribute) -> bool {
[sym::proc_macro, sym::proc_macro_attribute, sym::proc_macro_derive]
.iter().any(|kind| attr.check_name(*kind))
}