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macros: update doc comment for diagnostic derive

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The documentation comment for this derive is out-of-date, it should have
been updated in #95512.

Signed-off-by: David Wood <david.wood@huawei.com>
This commit is contained in:
David Wood 2022-04-21 04:22:18 +01:00
parent 437468daf7
commit f79d5e9458
1 changed files with 18 additions and 8 deletions
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26
compiler/rustc_macros/src/session_diagnostic.rs
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@ -16,20 +16,27 @@ use std::collections::{BTreeSet, HashMap};
/// # extern crate rust_middle;
/// # use rustc_middle::ty::Ty;
/// #[derive(SessionDiagnostic)]
/// #[error(code = "E0505", slug = "move-out-of-borrow-error")]
/// #[error(code = "E0505", slug = "borrowck-move-out-of-borrow")]
/// pub struct MoveOutOfBorrowError<'tcx> {
/// pub name: Ident,
/// pub ty: Ty<'tcx>,
/// #[primary_span]
/// #[label = "cannot move out of borrow"]
/// #[label]
/// pub span: Span,
/// #[label = "`{ty}` first borrowed here"]
/// pub other_span: Span,
/// #[suggestion(message = "consider cloning here", code = "{name}.clone()")]
/// pub opt_sugg: Option<(Span, Applicability)>
/// #[label = "first-borrow-label"]
/// pub first_borrow_span: Span,
/// #[suggestion(code = "{name}.clone()")]
/// pub clone_sugg: Option<(Span, Applicability)>
/// }
/// ```
///
/// ```fluent
/// move-out-of-borrow = cannot move out of {$name} because it is borrowed
/// .label = cannot move out of borrow
/// .first-borrow-label = `{$ty}` first borrowed here
/// .suggestion = consider cloning here
/// ```
///
/// Then, later, to emit the error:
///
/// ```ignore (pseudo-rust)
@ -37,10 +44,13 @@ use std::collections::{BTreeSet, HashMap};
/// expected,
/// actual,
/// span,
/// other_span,
/// opt_sugg: Some(suggestion, Applicability::MachineApplicable),
/// first_borrow_span,
/// clone_sugg: Some(suggestion, Applicability::MachineApplicable),
/// });
/// ```
///
/// See rustc dev guide for more examples on using the `#[derive(SessionDiagnostic)]`:
/// <https://rustc-dev-guide.rust-lang.org/diagnostics/sessiondiagnostic.html>
pub fn session_diagnostic_derive(s: synstructure::Structure<'_>) -> proc_macro2::TokenStream {
// Names for the diagnostic we build and the session we build it from.
let diag = format_ident!("diag");