rustc_attr_parsing/attributes/diagnostic/
on_unmatch_args.rs

1use rustc_errors::Diagnostic;
2use rustc_hir::attrs::diagnostic::Directive;
3use rustc_session::lint::builtin::MISPLACED_DIAGNOSTIC_ATTRIBUTES;
4
5use crate::attributes::diagnostic::*;
6use crate::attributes::prelude::*;
7use crate::errors::DiagnosticOnUnmatchArgsOnlyForMacros;
8
9#[derive(#[automatically_derived]
impl ::core::default::Default for OnUnmatchArgsParser {
    #[inline]
    fn default() -> OnUnmatchArgsParser {
        OnUnmatchArgsParser {
            span: ::core::default::Default::default(),
            directive: ::core::default::Default::default(),
        }
    }
}Default)]
10pub(crate) struct OnUnmatchArgsParser {
11    span: Option<Span>,
12    directive: Option<(Span, Directive)>,
13}
14
15impl AttributeParser for OnUnmatchArgsParser {
16    const ATTRIBUTES: AcceptMapping<Self> = &[(
17        &[sym::diagnostic, sym::on_unmatch_args],
18        ::rustc_feature::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 = "...""#]),
19        |this, cx, args| {
20            if !cx.features().diagnostic_on_unmatch_args() {
21                return;
22            }
23
24            let span = cx.attr_span;
25            this.span = Some(span);
26
27            if !#[allow(non_exhaustive_omitted_patterns)] match cx.target {
    Target::MacroDef => true,
    _ => false,
}matches!(cx.target, Target::MacroDef) {
28                cx.emit_lint(
29                    MISPLACED_DIAGNOSTIC_ATTRIBUTES,
30                    move |dcx, level| DiagnosticOnUnmatchArgsOnlyForMacros.into_diag(dcx, level),
31                    span,
32                );
33                return;
34            }
35
36            let mode = Mode::DiagnosticOnUnmatchArgs;
37            let Some(items) = parse_list(cx, args, mode) else { return };
38
39            let Some(directive) = parse_directive_items(cx, mode, items.mixed(), true) else {
40                return;
41            };
42            merge_directives(cx, &mut this.directive, (span, directive));
43        },
44    )];
45
46    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(ALL_TARGETS);
47
48    fn finalize(self, _cx: &FinalizeContext<'_, '_>) -> Option<AttributeKind> {
49        if let Some(span) = self.span {
50            Some(AttributeKind::OnUnmatchArgs {
51                span,
52                directive: self.directive.map(|d| Box::new(d.1)),
53            })
54        } else {
55            None
56        }
57    }
58}
rustc_attr_parsing/attributes/diagnostic/on_unmatch_args.rs

rustc_attr_parsing/attributes/diagnostic/
on_unmatch_args.rs
