compiler/rustc_attr_parsing/src/attributes/pin_v2.rs

use rustc_hir::Target;
use rustc_hir::attrs::AttributeKind;
use rustc_span::{Span, Symbol, sym};

use crate::attributes::{NoArgsAttributeParser, OnDuplicate};
use crate::context::Stage;
use crate::target_checking::AllowedTargets;
use crate::target_checking::Policy::Allow;

pub(crate) struct PinV2Parser;

impl<S: Stage> NoArgsAttributeParser<S> for PinV2Parser {
    const PATH: &[Symbol] = &[sym::pin_v2];
    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Warn;
    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[
        Allow(Target::Enum),
        Allow(Target::Struct),
        Allow(Target::Union),
    ]);
    const CREATE: fn(Span) -> AttributeKind = AttributeKind::PinV2;
}