rustc_attr_parsing/attributes/diagnostic/
on_unimplemented.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::DiagnosticOnUnimplementedOnlyForTraits;
8
9#[derive(#[automatically_derived]
impl ::core::default::Default for OnUnimplementedParser {
    #[inline]
    fn default() -> OnUnimplementedParser {
        OnUnimplementedParser {
            span: ::core::default::Default::default(),
            directive: ::core::default::Default::default(),
        }
    }
}Default)]
10pub(crate) struct OnUnimplementedParser {
11    span: Option<Span>,
12    directive: Option<(Span, Directive)>,
13}
14
15impl OnUnimplementedParser {
16    fn parse<'sess>(&mut self, cx: &mut AcceptContext<'_, 'sess>, args: &ArgParser, mode: Mode) {
17        let span = cx.attr_span;
18        self.span = Some(span);
19
20        if !#[allow(non_exhaustive_omitted_patterns)] match cx.target {
    Target::Trait => true,
    _ => false,
}matches!(cx.target, Target::Trait) {
21            cx.emit_lint(
22                MISPLACED_DIAGNOSTIC_ATTRIBUTES,
23                move |dcx, level| DiagnosticOnUnimplementedOnlyForTraits.into_diag(dcx, level),
24                span,
25            );
26            return;
27        }
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}
36
37impl AttributeParser for OnUnimplementedParser {
38    const ATTRIBUTES: AcceptMapping<Self> = &[
39        (
40            &[sym::diagnostic, sym::on_unimplemented],
41            ::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 = "...""#]),
42            |this, cx, args| {
43                this.parse(cx, args, Mode::DiagnosticOnUnimplemented);
44            },
45        ),
46        (
47            &[sym::rustc_on_unimplemented],
48            ::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 = "...""#]),
49            |this, cx, args| {
50                this.parse(cx, args, Mode::RustcOnUnimplemented);
51            },
52        ),
53    ];
54    //FIXME attribute is not parsed for non-traits but diagnostics are issued in `check_attr.rs`
55    const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(ALL_TARGETS);
56
57    fn finalize(self, _cx: &FinalizeContext<'_, '_>) -> Option<AttributeKind> {
58        if let Some(span) = self.span {
59            Some(AttributeKind::OnUnimplemented {
60                span,
61                directive: self.directive.map(|d| Box::new(d.1)),
62            })
63        } else {
64            None
65        }
66    }
67}
rustc_attr_parsing/attributes/diagnostic/on_unimplemented.rs

rustc_attr_parsing/attributes/diagnostic/
on_unimplemented.rs
