Make it more clear when complaining about async fn's return types
This commit is contained in:
Gus Wynn
parent
ffeeb20398
commit
20e032e650
@ -102,43 +102,89 @@ pub(super) fn try_report_anon_anon_conflict(&self) -> Option<ErrorReported> {
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None => String::new(),
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};
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let (span_1, span_2, main_label, span_label) = match (sup_is_ret_type, sub_is_ret_type) {
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(None, None) => {
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let (main_label_1, span_label_1) = if ty_sup.hir_id == ty_sub.hir_id {
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(
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"this type is declared with multiple lifetimes...".to_owned(),
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"...but data with one lifetime flows into the other here".to_owned(),
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)
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} else {
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(
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"these two types are declared with different lifetimes...".to_owned(),
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format!("...but data{} flows{} here", span_label_var1, span_label_var2),
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)
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};
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(ty_sup.span, ty_sub.span, main_label_1, span_label_1)
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}
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let (span_1, span_2, main_label, span_label, future_return_type) =
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match (sup_is_ret_type, sub_is_ret_type) {
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(None, None) => {
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let (main_label_1, span_label_1) = if ty_sup.hir_id == ty_sub.hir_id {
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(
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"this type is declared with multiple lifetimes...".to_owned(),
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"...but data with one lifetime flows into the other here".to_owned(),
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)
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} else {
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(
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"these two types are declared with different lifetimes...".to_owned(),
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format!("...but data{} flows{} here", span_label_var1, span_label_var2),
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)
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};
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(ty_sup.span, ty_sub.span, main_label_1, span_label_1, None)
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}
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(Some(ret_span), _) => (
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ty_sub.span,
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ret_span,
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"this parameter and the return type are declared with different lifetimes..."
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.to_owned(),
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format!("...but data{} is returned here", span_label_var1),
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),
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(_, Some(ret_span)) => (
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ty_sup.span,
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ret_span,
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"this parameter and the return type are declared with different lifetimes..."
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.to_owned(),
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format!("...but data{} is returned here", span_label_var1),
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),
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};
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(Some(ret_span), _) => {
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let sup_future = self.future_return_type(scope_def_id_sup);
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let (return_type, action) = if let Some(_) = sup_future {
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("returned future", "held across an await point")
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} else {
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("return type", "returned")
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};
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struct_span_err!(self.tcx().sess, span, E0623, "lifetime mismatch")
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.span_label(span_1, main_label)
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.span_label(span_2, String::new())
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.span_label(span, span_label)
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.emit();
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(
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ty_sub.span,
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ret_span,
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format!(
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"this parameter and the {} are declared with different lifetimes...",
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return_type
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),
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format!("...but data{} is {} here", span_label_var1, action),
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sup_future,
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)
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}
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(_, Some(ret_span)) => {
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let sub_future = self.future_return_type(scope_def_id_sub);
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let (return_type, action) = if let Some(_) = sub_future {
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("returned future", "held across an await point")
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} else {
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("return type", "returned")
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};
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(
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ty_sup.span,
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ret_span,
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format!(
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"this parameter and the {} are declared with different lifetimes...",
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return_type
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),
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format!("...but data{} is {} here", span_label_var1, action),
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sub_future,
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)
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}
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};
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let mut e = struct_span_err!(self.tcx().sess, span, E0623, "lifetime mismatch");
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e.span_label(span_1, main_label);
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e.span_label(span_2, String::new());
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e.span_label(span, span_label);
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if let Some(t) = future_return_type {
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let snip = self
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.tcx()
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.sess
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.source_map()
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.span_to_snippet(t.span)
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.ok()
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.and_then(|s| match (&t.kind, s.as_str()) {
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(rustc_hir::TyKind::Tup(&[]), "") => Some("()".to_string()),
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(_, "") => None,
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_ => Some(s),
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})
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.unwrap_or("{unnamed_type}".to_string());
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e.span_label(
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t.span,
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&format!("this `async fn` implicitly returns an `impl Future<Output = {}>`", snip),
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);
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}
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e.emit();
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Some(ErrorReported)
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}
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}
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@ -85,6 +85,60 @@ pub(super) fn find_param_with_region(
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})
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}
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pub(super) fn future_return_type(
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&self,
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local_def_id: LocalDefId,
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) -> Option<&rustc_hir::Ty<'_>> {
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if let Some(hir::IsAsync::Async) = self.asyncness(local_def_id) {
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if let rustc_middle::ty::Opaque(def_id, _) =
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self.tcx().type_of(local_def_id).fn_sig(self.tcx()).output().skip_binder().kind()
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{
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match self.tcx().hir().get_if_local(*def_id) {
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Some(hir::Node::Item(hir::Item {
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kind:
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hir::ItemKind::OpaqueTy(hir::OpaqueTy {
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bounds,
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origin: hir::OpaqueTyOrigin::AsyncFn,
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..
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}),
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..
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})) => {
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for b in bounds.iter() {
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if let hir::GenericBound::LangItemTrait(
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hir::LangItem::Future,
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_span,
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_hir_id,
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generic_args,
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) = b
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{
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for type_binding in generic_args.bindings.iter() {
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if type_binding.ident.name == rustc_span::sym::Output {
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if let hir::TypeBindingKind::Equality { ty } =
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type_binding.kind
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{
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return Some(ty);
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}
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}
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}
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}
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}
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}
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_ => {}
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}
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}
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}
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None
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}
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pub(super) fn asyncness(&self, local_def_id: LocalDefId) -> Option<hir::IsAsync> {
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// similar to the asyncness fn in rustc_ty::ty
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let hir_id = self.tcx().hir().local_def_id_to_hir_id(local_def_id);
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let node = self.tcx().hir().get(hir_id);
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let fn_like = rustc_middle::hir::map::blocks::FnLikeNode::from_node(node)?;
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Some(fn_like.asyncness())
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}
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// Here, we check for the case where the anonymous region
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// is in the return type.
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// FIXME(#42703) - Need to handle certain cases here.
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@ -2,12 +2,14 @@ error[E0623]: lifetime mismatch
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--> $DIR/issue-63388-1.rs:14:9
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LL | &'a self, foo: &dyn Foo
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| -------- this parameter and the return type are declared with different lifetimes...
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| -------- this parameter and the returned future are declared with different lifetimes...
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LL | ) -> &dyn Foo
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| --------
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| |
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| this `async fn` implicitly returns an `impl Future<Output = &dyn Foo>`
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LL | {
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LL | foo
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| ^^^ ...but data from `foo` is returned here
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| ^^^ ...but data from `foo` is held across an await point here
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error: aborting due to previous error
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@ -4,8 +4,9 @@ error[E0623]: lifetime mismatch
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LL | async fn async_ret_impl_trait1<'a, 'b>(a: &'a u8, b: &'b u8) -> impl Trait<'a> {
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| ------ ^^^^^^^^^^^^^^
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| | |
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| | ...but data from `b` is returned here
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| this parameter and the return type are declared with different lifetimes...
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| | ...but data from `b` is held across an await point here
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| | this `async fn` implicitly returns an `impl Future<Output = impl Trait<'a>>`
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| this parameter and the returned future are declared with different lifetimes...
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error: aborting due to previous error
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38
src/test/ui/issues/issue-76547.rs
Normal file
38
src/test/ui/issues/issue-76547.rs
Normal file
@ -0,0 +1,38 @@
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// Test for for diagnostic improvement issue #76547
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// edition:2018
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use std::{
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future::Future,
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task::{Context, Poll}
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};
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use std::pin::Pin;
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pub struct ListFut<'a>(&'a mut [&'a mut [u8]]);
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impl<'a> Future for ListFut<'a> {
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type Output = ();
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fn poll(self: Pin<&mut Self>, _cx: &mut Context) -> Poll<Self::Output> {
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unimplemented!()
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}
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}
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async fn fut(bufs: &mut [&mut [u8]]) {
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ListFut(bufs).await
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//~^ ERROR lifetime mismatch
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}
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pub struct ListFut2<'a>(&'a mut [&'a mut [u8]]);
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impl<'a> Future for ListFut2<'a> {
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type Output = i32;
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fn poll(self: Pin<&mut Self>, _cx: &mut Context) -> Poll<Self::Output> {
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unimplemented!()
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}
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}
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async fn fut2(bufs: &mut [&mut [u8]]) -> i32 {
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ListFut2(bufs).await
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//~^ ERROR lifetime mismatch
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}
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fn main() {}
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25
src/test/ui/issues/issue-76547.stderr
Normal file
25
src/test/ui/issues/issue-76547.stderr
Normal file
@ -0,0 +1,25 @@
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error[E0623]: lifetime mismatch
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--> $DIR/issue-76547.rs:20:13
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LL | async fn fut(bufs: &mut [&mut [u8]]) {
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| --------- -
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = ()>`
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| this parameter and the returned future are declared with different lifetimes...
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LL | ListFut(bufs).await
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| ^^^^ ...but data from `bufs` is held across an await point here
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error[E0623]: lifetime mismatch
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--> $DIR/issue-76547.rs:34:14
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LL | async fn fut2(bufs: &mut [&mut [u8]]) -> i32 {
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| --------- ---
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = i32>`
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| this parameter and the returned future are declared with different lifetimes...
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LL | ListFut2(bufs).await
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| ^^^^ ...but data from `bufs` is held across an await point here
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0623`.
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@ -2,25 +2,28 @@ error[E0623]: lifetime mismatch
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--> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:8:52
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LL | async fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
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| ---- ---- ^ ...but data from `f` is returned here
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| |
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| this parameter and the return type are declared with different lifetimes...
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| ---- ---- ^ ...but data from `f` is held across an await point here
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &Foo>`
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| this parameter and the returned future are declared with different lifetimes...
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error[E0623]: lifetime mismatch
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--> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:11:82
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LL | async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
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| ----- ----------------- ^ ...but data from `f` is returned here
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| |
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| this parameter and the return type are declared with different lifetimes...
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| ----- ----------------- ^ ...but data from `f` is held across an await point here
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = (Pin<&Foo>, &Foo)>`
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| this parameter and the returned future are declared with different lifetimes...
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error[E0623]: lifetime mismatch
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--> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:17:64
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|
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LL | async fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> &() { arg }
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| ----- --- ^^^ ...but data from `arg` is returned here
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| |
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| this parameter and the return type are declared with different lifetimes...
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| ----- --- ^^^ ...but data from `arg` is held across an await point here
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &()>`
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| this parameter and the returned future are declared with different lifetimes...
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error: aborting due to 3 previous errors
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@ -3,60 +3,66 @@ error[E0623]: lifetime mismatch
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|
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LL | async fn ref_self(&self, f: &u32) -> &u32 {
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| ----- ----
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| |
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| this parameter and the return type are declared with different lifetimes...
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
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| this parameter and the returned future are declared with different lifetimes...
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LL | f
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| ^ ...but data from `f` is returned here
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| ^ ...but data from `f` is held across an await point here
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error[E0623]: lifetime mismatch
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--> $DIR/lt-ref-self-async.rs:19:9
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|
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LL | async fn ref_Self(self: &Self, f: &u32) -> &u32 {
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| ----- ----
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| |
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| this parameter and the return type are declared with different lifetimes...
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
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| this parameter and the returned future are declared with different lifetimes...
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LL | f
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| ^ ...but data from `f` is returned here
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| ^ ...but data from `f` is held across an await point here
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error[E0623]: lifetime mismatch
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--> $DIR/lt-ref-self-async.rs:23:9
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|
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LL | async fn box_ref_Self(self: Box<&Self>, f: &u32) -> &u32 {
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| ----- ----
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| |
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| this parameter and the return type are declared with different lifetimes...
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
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| this parameter and the returned future are declared with different lifetimes...
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LL | f
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| ^ ...but data from `f` is returned here
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| ^ ...but data from `f` is held across an await point here
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error[E0623]: lifetime mismatch
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--> $DIR/lt-ref-self-async.rs:27:9
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|
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LL | async fn pin_ref_Self(self: Pin<&Self>, f: &u32) -> &u32 {
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| ----- ----
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| |
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| this parameter and the return type are declared with different lifetimes...
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
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| this parameter and the returned future are declared with different lifetimes...
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LL | f
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| ^ ...but data from `f` is returned here
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| ^ ...but data from `f` is held across an await point here
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error[E0623]: lifetime mismatch
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--> $DIR/lt-ref-self-async.rs:31:9
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|
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LL | async fn box_box_ref_Self(self: Box<Box<&Self>>, f: &u32) -> &u32 {
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| ----- ----
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| |
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| this parameter and the return type are declared with different lifetimes...
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
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| this parameter and the returned future are declared with different lifetimes...
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LL | f
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| ^ ...but data from `f` is returned here
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| ^ ...but data from `f` is held across an await point here
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error[E0623]: lifetime mismatch
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--> $DIR/lt-ref-self-async.rs:35:9
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|
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LL | async fn box_pin_Self(self: Box<Pin<&Self>>, f: &u32) -> &u32 {
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| ----- ----
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| |
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| this parameter and the return type are declared with different lifetimes...
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
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| this parameter and the returned future are declared with different lifetimes...
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LL | f
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| ^ ...but data from `f` is returned here
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| ^ ...but data from `f` is held across an await point here
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error: aborting due to 6 previous errors
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@ -3,60 +3,66 @@ error[E0623]: lifetime mismatch
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|
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LL | async fn ref_self(&mut self, f: &u32) -> &u32 {
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| --------- ----
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| |
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| this parameter and the return type are declared with different lifetimes...
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
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| this parameter and the returned future are declared with different lifetimes...
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LL | f
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| ^ ...but data from `f` is returned here
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| ^ ...but data from `f` is held across an await point here
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error[E0623]: lifetime mismatch
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--> $DIR/ref-mut-self-async.rs:19:9
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|
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LL | async fn ref_Self(self: &mut Self, f: &u32) -> &u32 {
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| --------- ----
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| |
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| this parameter and the return type are declared with different lifetimes...
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
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| this parameter and the returned future are declared with different lifetimes...
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LL | f
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| ^ ...but data from `f` is returned here
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| ^ ...but data from `f` is held across an await point here
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error[E0623]: lifetime mismatch
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--> $DIR/ref-mut-self-async.rs:23:9
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|
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LL | async fn box_ref_Self(self: Box<&mut Self>, f: &u32) -> &u32 {
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| --------- ----
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| |
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| this parameter and the return type are declared with different lifetimes...
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| | |
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| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-self-async.rs:27:9
|
||||
|
|
||||
LL | async fn pin_ref_Self(self: Pin<&mut Self>, f: &u32) -> &u32 {
|
||||
| --------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-self-async.rs:31:9
|
||||
|
|
||||
LL | async fn box_box_ref_Self(self: Box<Box<&mut Self>>, f: &u32) -> &u32 {
|
||||
| --------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-self-async.rs:35:9
|
||||
|
|
||||
LL | async fn box_pin_ref_Self(self: Box<Pin<&mut Self>>, f: &u32) -> &u32 {
|
||||
| --------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error: aborting due to 6 previous errors
|
||||
|
||||
|
||||
@ -3,50 +3,55 @@ error[E0623]: lifetime mismatch
|
||||
|
|
||||
LL | async fn ref_Struct(self: &mut Struct, f: &u32) -> &u32 {
|
||||
| ----------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-struct-async.rs:17:9
|
||||
|
|
||||
LL | async fn box_ref_Struct(self: Box<&mut Struct>, f: &u32) -> &u32 {
|
||||
| ----------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-struct-async.rs:21:9
|
||||
|
|
||||
LL | async fn pin_ref_Struct(self: Pin<&mut Struct>, f: &u32) -> &u32 {
|
||||
| ----------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-struct-async.rs:25:9
|
||||
|
|
||||
LL | async fn box_box_ref_Struct(self: Box<Box<&mut Struct>>, f: &u32) -> &u32 {
|
||||
| ----------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-struct-async.rs:29:9
|
||||
|
|
||||
LL | async fn box_pin_ref_Struct(self: Box<Pin<&mut Struct>>, f: &u32) -> &u32 {
|
||||
| ----------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error: aborting due to 5 previous errors
|
||||
|
||||
|
||||
@ -3,70 +3,77 @@ error[E0623]: lifetime mismatch
|
||||
|
|
||||
LL | async fn ref_self(&self, f: &u32) -> &u32 {
|
||||
| ----- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-self-async.rs:29:9
|
||||
|
|
||||
LL | async fn ref_Self(self: &Self, f: &u32) -> &u32 {
|
||||
| ----- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-self-async.rs:33:9
|
||||
|
|
||||
LL | async fn box_ref_Self(self: Box<&Self>, f: &u32) -> &u32 {
|
||||
| ----- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-self-async.rs:37:9
|
||||
|
|
||||
LL | async fn pin_ref_Self(self: Pin<&Self>, f: &u32) -> &u32 {
|
||||
| ----- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-self-async.rs:41:9
|
||||
|
|
||||
LL | async fn box_box_ref_Self(self: Box<Box<&Self>>, f: &u32) -> &u32 {
|
||||
| ----- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-self-async.rs:45:9
|
||||
|
|
||||
LL | async fn box_pin_ref_Self(self: Box<Pin<&Self>>, f: &u32) -> &u32 {
|
||||
| ----- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-self-async.rs:49:9
|
||||
|
|
||||
LL | async fn wrap_ref_Self_Self(self: Wrap<&Self, Self>, f: &u8) -> &u8 {
|
||||
| ----- ---
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u8>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error: aborting due to 7 previous errors
|
||||
|
||||
|
||||
@ -3,50 +3,55 @@ error[E0623]: lifetime mismatch
|
||||
|
|
||||
LL | async fn ref_Struct(self: &Struct, f: &u32) -> &u32 {
|
||||
| ------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-struct-async.rs:17:9
|
||||
|
|
||||
LL | async fn box_ref_Struct(self: Box<&Struct>, f: &u32) -> &u32 {
|
||||
| ------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-struct-async.rs:21:9
|
||||
|
|
||||
LL | async fn pin_ref_Struct(self: Pin<&Struct>, f: &u32) -> &u32 {
|
||||
| ------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-struct-async.rs:25:9
|
||||
|
|
||||
LL | async fn box_box_ref_Struct(self: Box<Box<&Struct>>, f: &u32) -> &u32 {
|
||||
| ------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-struct-async.rs:29:9
|
||||
|
|
||||
LL | async fn box_pin_Struct(self: Box<Pin<&Struct>>, f: &u32) -> &u32 {
|
||||
| ------- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
| | |
|
||||
| | this `async fn` implicitly returns an `impl Future<Output = &u32>`
|
||||
| this parameter and the returned future are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` is returned here
|
||||
| ^ ...but data from `f` is held across an await point here
|
||||
|
||||
error: aborting due to 5 previous errors
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user