bjoernager/rust
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Add ErrorGuaranteed to Recovered::Yes and use it more.

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The starting point for this was identical comments on two different
fields, in `ast::VariantData::Struct` and `hir::VariantData::Struct`:
```
    // FIXME: investigate making this a `Option<ErrorGuaranteed>`
    recovered: bool
```
I tried that, and then found that I needed to add an `ErrorGuaranteed`
to `Recovered::Yes`. Then I ended up using `Recovered` instead of
`Option<ErrorGuaranteed>` for these two places and elsewhere, which
required moving `ErrorGuaranteed` from `rustc_parse` to `rustc_ast`.

This makes things more consistent, because `Recovered` is used in more
places, and there are fewer uses of `bool` and
`Option<ErrorGuaranteed>`. And safer, because it's difficult/impossible
to set `recovered` to `Recovered::Yes` without having emitted an error.
This commit is contained in:
Nicholas Nethercote 2024-05-09 18:44:40 +10:00
parent 87293c9585
commit fd91925bce
16 changed files with 91 additions and 105 deletions
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22
compiler/rustc_parse/src/parser/mod.rs
View file

@ -27,13 +27,12 @@ use rustc_ast::tokenstream::{TokenStream, TokenTree, TokenTreeCursor};
use rustc_ast::util::case::Case;
use rustc_ast::{
self as ast, AnonConst, AttrArgs, AttrArgsEq, AttrId, ByRef, Const, CoroutineKind, DelimArgs,
Expr, ExprKind, Extern, HasAttrs, HasTokens, Mutability, StrLit, Unsafe, Visibility,
Expr, ExprKind, Extern, HasAttrs, HasTokens, Mutability, Recovered, StrLit, Unsafe, Visibility,
VisibilityKind, DUMMY_NODE_ID,
};
use rustc_ast_pretty::pprust;
use rustc_data_structures::fx::FxHashMap;
use rustc_errors::PResult;
use rustc_errors::{Applicability, Diag, FatalError, MultiSpan};
use rustc_errors::{Applicability, Diag, FatalError, MultiSpan, PResult};
use rustc_session::parse::ParseSess;
use rustc_span::symbol::{kw, sym, Ident, Symbol};
use rustc_span::{Span, DUMMY_SP};
@ -374,19 +373,6 @@ pub enum FollowedByType {
No,
}
/// Whether a function performed recovery
#[derive(Copy, Clone, Debug)]
pub enum Recovered {
No,
Yes,
}
impl From<Recovered> for bool {
fn from(r: Recovered) -> bool {
matches!(r, Recovered::Yes)
}
}
#[derive(Copy, Clone, Debug)]
pub enum Trailing {
No,
@ -856,9 +842,9 @@ impl<'a> Parser<'a> {
Ok(Recovered::No) => {
self.current_closure.take();
}
Ok(Recovered::Yes) => {
Ok(Recovered::Yes(guar)) => {
self.current_closure.take();
recovered = Recovered::Yes;
recovered = Recovered::Yes(guar);
break;
}
Err(mut expect_err) => {