rustc_attr_parsing/attributes/diagnostic/
on_move.rs

1use rustc_feature::AttributeStability;
2use rustc_hir::attrs::AttributeKind;
3use rustc_span::sym;
4
5use crate::attributes::diagnostic::*;
6use crate::attributes::prelude::*;
7use crate::context::AcceptContext;
8use crate::parser::ArgParser;
9use crate::target_checking::AllowedTargets;
10use crate::template;
11
12#[derive(#[automatically_derived]
impl ::core::default::Default for OnMoveParser {
    #[inline]
    fn default() -> OnMoveParser {
        OnMoveParser {
            span: ::core::default::Default::default(),
            directive: ::core::default::Default::default(),
        }
    }
}Default)]
13pub(crate) struct OnMoveParser {
14    span: Option<Span>,
15    directive: Option<(Span, Directive)>,
16}
17
18impl OnMoveParser {
19    fn parse<'sess>(&mut self, cx: &mut AcceptContext<'_, 'sess>, args: &ArgParser, mode: Mode) {
20        if !cx.features().diagnostic_on_move() {
21            // `UnknownDiagnosticAttribute` is emitted in rustc_resolve/macros.rs
22            args.ignore_args();
23            return;
24        }
25
26        let span = cx.attr_span;
27        self.span = Some(span);
28
29        let Some(items) = parse_list(cx, args, mode) else { return };
30
31        if let Some(directive) = parse_directive_items(cx, mode, items.mixed(), true) {
32            merge_directives(cx, &mut self.directive, (span, directive));
33        }
34    }
35}
36impl AttributeParser for OnMoveParser {
37    const ATTRIBUTES: AcceptMapping<Self> = &[(
38        &[sym::diagnostic, sym::on_move],
39        crate::AttributeTemplate {
    word: false,
    list: Some(&[r#"/*opt*/ message = "...", /*opt*/ label = "...", /*opt*/ note = "...""#]),
    one_of: &[],
    name_value_str: None,
    docs: None,
}template!(List: &[r#"/*opt*/ message = "...", /*opt*/ label = "...", /*opt*/ note = "...""#]),
40        AttributeStability::Stable, // Unstable, stability checked manually in the parser
41        |this, cx, args| {
42            this.parse(cx, args, Mode::DiagnosticOnMove);
43        },
44    )];
45
46    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowListWarnRest(&[
47        Allow(Target::Enum),
48        Allow(Target::Struct),
49        Allow(Target::Union),
50    ]);
51
52    fn finalize(self, _cx: &FinalizeContext<'_, '_>) -> Option<AttributeKind> {
53        if let Some(_span) = self.span {
54            Some(AttributeKind::OnMove { directive: self.directive.map(|d| Box::new(d.1)) })
55        } else {
56            None
57        }
58    }
59}
rustc_attr_parsing/attributes/diagnostic/on_move.rs

rustc_attr_parsing/attributes/diagnostic/
on_move.rs
