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Add explicit syntax for coroutines instead of relying on closures having yield expressions

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This commit is contained in:
Oli Scherer 2024-04-11 12:48:32 +00:00
parent 29a56a3b1c
commit a589632dad
3 changed files with 19 additions and 3 deletions
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12
compiler/rustc_ast_lowering/src/expr.rs
View File

@ -217,6 +217,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
binder,
*capture_clause,
e.id,
hir_id,
*constness,
*movability,
fn_decl,
@ -955,6 +956,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
binder: &ClosureBinder,
capture_clause: CaptureBy,
closure_id: NodeId,
closure_hir_id: hir::HirId,
constness: Const,
movability: Movability,
decl: &FnDecl,
@ -965,7 +967,15 @@ impl<'hir> LoweringContext<'_, 'hir> {
let (binder_clause, generic_params) = self.lower_closure_binder(binder);
let (body_id, closure_kind) = self.with_new_scopes(fn_decl_span, move |this| {
let mut coroutine_kind = None;
let mut coroutine_kind = if this
.attrs
.get(&closure_hir_id.local_id)
.is_some_and(|attrs| attrs.iter().any(|attr| attr.has_name(sym::coroutine)))
{
Some(hir::CoroutineKind::Coroutine(Movability::Movable))
} else {
None
};
let body_id = this.lower_fn_body(decl, |this| {
let e = this.lower_expr_mut(body);
coroutine_kind = this.coroutine_kind;

6
compiler/rustc_feature/src/builtin_attrs.rs
View File

@ -534,6 +534,12 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
EncodeCrossCrate::Yes, experimental!(cfi_encoding)
),
// `#[coroutine]` attribute to be applied to closures to make them coroutines instead
gated!(
coroutine, Normal, template!(Word), ErrorFollowing,
EncodeCrossCrate::No, coroutines, experimental!(coroutines)
),
// ==========================================================================
// Internal attributes: Stability, deprecation, and unsafe:
// ==========================================================================

4
tests/ui/coroutine/derived-drop-parent-expr.rs
View File

@ -10,7 +10,7 @@ pub struct Client { pub nickname: String }
fn main() {
let g = move || match drop(Client { ..Client::default() }) {
_status => yield,
};
_status => yield,
};
assert_send(g);
}