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macros: support doc comments in diag derives

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Documentation comments shouldn't affect the diagnostic derive in any
way, but explicit support has to be added for ignoring the `doc`
attribute.

Signed-off-by: David Wood <david.wood@huawei.com>
This commit is contained in:
David Wood
2022-10-14 11:00:46 +01:00
parent 1536ab1b38
commit 7fbaf27696
5 changed files with 90 additions and 14 deletions
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17
compiler/rustc_macros/src/diagnostics/utils.rs
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@@ -477,7 +477,12 @@ impl SubdiagnosticKind {
pub(super) fn from_attr(
attr: &Attribute,
fields: &impl HasFieldMap,
) -> Result<(SubdiagnosticKind, Option<Path>), DiagnosticDeriveError> {
) -> Result<Option<(SubdiagnosticKind, Option<Path>)>, DiagnosticDeriveError> {
// Always allow documentation comments.
if is_doc_comment(attr) {
return Ok(None);
}
let span = attr.span().unwrap();
let name = attr.path.segments.last().unwrap().ident.to_string();
@@ -526,7 +531,9 @@ impl SubdiagnosticKind {
| SubdiagnosticKind::Note
| SubdiagnosticKind::Help
| SubdiagnosticKind::Warn
| SubdiagnosticKind::MultipartSuggestion { .. } => return Ok((kind, None)),
| SubdiagnosticKind::MultipartSuggestion { .. } => {
return Ok(Some((kind, None)));
}
SubdiagnosticKind::Suggestion { .. } => {
throw_span_err!(span, "suggestion without `code = \"...\"`")
}
@@ -626,7 +633,7 @@ impl SubdiagnosticKind {
| SubdiagnosticKind::MultipartSuggestion { .. } => {}
}
Ok((kind, slug))
Ok(Some((kind, slug)))
}
}
@@ -654,3 +661,7 @@ impl quote::IdentFragment for SubdiagnosticKind {
pub(super) fn should_generate_set_arg(field: &Field) -> bool {
field.attrs.is_empty()
}
pub(super) fn is_doc_comment(attr: &Attribute) -> bool {
attr.path.segments.last().unwrap().ident.to_string() == "doc"
}