rustc_attr_parsing/attributes/
must_not_suspend.rs

1use super::prelude::*;
2
3pub(crate) struct MustNotSuspendParser;
4
5impl<S: Stage> SingleAttributeParser<S> for MustNotSuspendParser {
6    const PATH: &[rustc_span::Symbol] = &[sym::must_not_suspend];
7    const ATTRIBUTE_ORDER: AttributeOrder = AttributeOrder::KeepInnermost;
8    const ON_DUPLICATE: OnDuplicate<S> = OnDuplicate::Error;
9    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[
10        Allow(Target::Struct),
11        Allow(Target::Enum),
12        Allow(Target::Union),
13        Allow(Target::Trait),
14    ]);
15    const TEMPLATE: AttributeTemplate = template!(Word, List: &["count"]);
16
17    fn convert(cx: &mut AcceptContext<'_, '_, S>, args: &ArgParser) -> Option<AttributeKind> {
18        let reason = match args {
19            ArgParser::NameValue(reason) => match reason.value_as_str() {
20                Some(val) => Some(val),
21                None => {
22                    cx.expected_nv_or_no_args(reason.value_span);
23                    return None;
24                }
25            },
26            ArgParser::NoArgs => None,
27            ArgParser::List(list) => {
28                cx.expected_nv_or_no_args(list.span);
29                return None;
30            }
31        };
32
33        Some(AttributeKind::MustNotSupend { reason })
34    }
35}

rustc_attr_parsing/attributes/must_not_suspend.rs

rustc_attr_parsing/attributes/
must_not_suspend.rs