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https://github.com/rust-lang/rust.git
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Revert "Auto merge of #91403 - cjgillot:inherit-async, r=oli-obk"
This reverts commit3cfa4def7c
, reversing changes made to5d8767cb22
.
This commit is contained in:
parent
30b3f35c42
commit
86d17b98f2
@ -1659,12 +1659,11 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
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// When we create the opaque type for this async fn, it is going to have
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// to capture all the lifetimes involved in the signature (including in the
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// return type). This is done by:
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// return type). This is done by introducing lifetime parameters for:
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//
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// - making the opaque type inherit all lifetime parameters from its parent;
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// - make all the elided lifetimes in the fn arguments into parameters;
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// - manually introducing parameters on the opaque type for elided
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// lifetimes in the return type.
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// - all the explicitly declared lifetimes from the impl and function itself;
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// - all the elided lifetimes in the fn arguments;
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// - all the elided lifetimes in the return type.
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//
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// So for example in this snippet:
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//
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@ -1680,14 +1679,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
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// we would create an opaque type like:
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//
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// ```
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// type Foo<'a>::bar<'b, '0, '1>::Bar<'2> = impl Future<Output = &'2 u32>;
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// type Bar<'a, 'b, '0, '1, '2> = impl Future<Output = &'2 u32>;
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// ```
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//
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// and we would then desugar `bar` to the equivalent of:
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//
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// ```rust
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// impl<'a> Foo<'a> {
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// fn bar<'b, '0, '1>(&'0 self, x: &'b Vec<f64>, y: &'1 str) -> Bar<'_>
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// fn bar<'b, '0, '1>(&'0 self, x: &'b Vec<f64>, y: &'1 str) -> Bar<'a, 'b, '0, '1, '_>
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// }
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// ```
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//
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@ -1695,7 +1694,29 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
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// this is because the elided lifetimes from the return type
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// should be figured out using the ordinary elision rules, and
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// this desugaring achieves that.
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let mut lifetime_params = Vec::new();
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debug!("lower_async_fn_ret_ty: in_scope_lifetimes={:#?}", self.in_scope_lifetimes);
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debug!("lower_async_fn_ret_ty: lifetimes_to_define={:#?}", self.lifetimes_to_define);
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// Calculate all the lifetimes that should be captured
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// by the opaque type. This should include all in-scope
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// lifetime parameters, including those defined in-band.
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//
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// `lifetime_params` is a vector of tuple (span, parameter name, lifetime name).
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// Input lifetime like `'a` or `'1`:
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let mut lifetime_params: Vec<_> = self
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.in_scope_lifetimes
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.iter()
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.cloned()
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.map(|name| (name.ident().span, name, hir::LifetimeName::Param(name)))
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.chain(
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self.lifetimes_to_define
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.iter()
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.map(|&(span, name)| (span, name, hir::LifetimeName::Param(name))),
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)
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.collect();
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self.with_hir_id_owner(opaque_ty_node_id, |this| {
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// We have to be careful to get elision right here. The
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// idea is that we create a lifetime parameter for each
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@ -1714,12 +1735,16 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
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debug!("lower_async_fn_ret_ty: future_bound={:#?}", future_bound);
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debug!("lower_async_fn_ret_ty: lifetimes_to_define={:#?}", lifetimes_to_define);
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// Output lifetime like `'_`:
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lifetime_params = lifetimes_to_define;
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lifetime_params.extend(
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// Output lifetime like `'_`:
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lifetimes_to_define
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.into_iter()
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.map(|(span, name)| (span, name, hir::LifetimeName::Implicit(false))),
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);
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debug!("lower_async_fn_ret_ty: lifetime_params={:#?}", lifetime_params);
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let generic_params =
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this.arena.alloc_from_iter(lifetime_params.iter().map(|&(span, hir_name)| {
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this.arena.alloc_from_iter(lifetime_params.iter().map(|&(span, hir_name, _)| {
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this.lifetime_to_generic_param(span, hir_name, opaque_ty_def_id)
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}));
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@ -1737,22 +1762,28 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
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this.generate_opaque_type(opaque_ty_def_id, opaque_ty_item, span, opaque_ty_span)
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});
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// We need to create the lifetime arguments to our opaque type.
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// Continuing with our example, we're creating the type arguments
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// for the return type:
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// As documented above on the variable
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// `input_lifetimes_count`, we need to create the lifetime
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// arguments to our opaque type. Continuing with our example,
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// we're creating the type arguments for the return type:
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//
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// ```
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// For<'a>::bar<'b, '0, '1>::Bar<'_>
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// Bar<'a, 'b, '0, '1, '_>
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// ```
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//
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// For the "input" lifetime parameters are inherited automatically.
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// For the "output" lifetime parameters, we just want to generate `'_`.
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// For the "input" lifetime parameters, we wish to create
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// references to the parameters themselves, including the
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// "implicit" ones created from parameter types (`'a`, `'b`,
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// '`0`, `'1`).
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//
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// For the "output" lifetime parameters, we just want to
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// generate `'_`.
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let generic_args =
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self.arena.alloc_from_iter(lifetime_params.into_iter().map(|(span, _)| {
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self.arena.alloc_from_iter(lifetime_params.into_iter().map(|(span, _, name)| {
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GenericArg::Lifetime(hir::Lifetime {
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hir_id: self.next_id(),
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span: self.lower_span(span),
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name: hir::LifetimeName::Implicit(false),
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name,
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})
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}));
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@ -2156,24 +2156,6 @@ impl<'tcx> RegionInferenceContext<'tcx> {
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}
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}
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// When in async fn, prefer errors that come from inside the closure.
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if !categorized_path[i].from_closure {
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let span = categorized_path.iter().find_map(|p| {
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if p.from_closure
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&& p.category == categorized_path[i].category
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&& categorized_path[i].cause.span.contains(p.cause.span)
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{
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Some(p.cause.span)
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} else {
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None
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}
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});
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if let Some(span) = span {
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categorized_path[i].cause.span = span;
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}
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}
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return categorized_path[i].clone();
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}
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@ -1,4 +1,4 @@
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`impl trait` return type cannot contain a projection
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`async fn`/`impl trait` return type cannot contain a projection
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or `Self` that references lifetimes from a parent scope.
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Erroneous code example:
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@ -7,7 +7,7 @@ Erroneous code example:
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struct S<'a>(&'a i32);
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impl<'a> S<'a> {
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fn new(i: &'a i32) -> impl Into<Self> {
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async fn new(i: &'a i32) -> Self {
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S(&22)
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}
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}
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@ -19,7 +19,7 @@ To fix this error we need to spell out `Self` to `S<'a>`:
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struct S<'a>(&'a i32);
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impl<'a> S<'a> {
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fn new(i: &'a i32) -> impl Into<S<'a>> {
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async fn new(i: &'a i32) -> S<'a> {
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S(&22)
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}
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}
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@ -276,7 +276,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
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debug!(?concrete_ty);
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let first_own_region = match opaque_defn.origin {
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hir::OpaqueTyOrigin::FnReturn(..) => {
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hir::OpaqueTyOrigin::FnReturn(..) | hir::OpaqueTyOrigin::AsyncFn(..) => {
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// We lower
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//
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// fn foo<'l0..'ln>() -> impl Trait<'l0..'lm>
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@ -291,7 +291,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
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}
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// These opaque type inherit all lifetime parameters from their
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// parent, so we have to check them all.
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hir::OpaqueTyOrigin::AsyncFn(..) | hir::OpaqueTyOrigin::TyAlias => 0,
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hir::OpaqueTyOrigin::TyAlias => 0,
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};
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// For a case like `impl Foo<'a, 'b>`, we would generate a constraint
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@ -729,16 +729,9 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
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match item.kind {
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hir::ItemKind::Fn(ref sig, ref generics, _) => {
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self.missing_named_lifetime_spots.push(generics.into());
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self.visit_early_late(
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None,
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item.hir_id(),
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&sig.decl,
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generics,
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sig.header.asyncness,
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|this| {
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intravisit::walk_item(this, item);
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},
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);
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self.visit_early_late(None, item.hir_id(), &sig.decl, generics, |this| {
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intravisit::walk_item(this, item);
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});
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self.missing_named_lifetime_spots.pop();
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}
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@ -856,16 +849,11 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
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fn visit_foreign_item(&mut self, item: &'tcx hir::ForeignItem<'tcx>) {
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match item.kind {
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hir::ForeignItemKind::Fn(ref decl, _, ref generics) => self.visit_early_late(
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None,
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item.hir_id(),
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decl,
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generics,
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hir::IsAsync::NotAsync,
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|this| {
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hir::ForeignItemKind::Fn(ref decl, _, ref generics) => {
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self.visit_early_late(None, item.hir_id(), decl, generics, |this| {
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intravisit::walk_foreign_item(this, item);
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},
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),
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})
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}
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hir::ForeignItemKind::Static(..) => {
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intravisit::walk_foreign_item(self, item);
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}
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@ -1142,7 +1130,6 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
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trait_item.hir_id(),
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&sig.decl,
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&trait_item.generics,
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sig.header.asyncness,
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|this| intravisit::walk_trait_item(this, trait_item),
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);
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self.missing_named_lifetime_spots.pop();
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@ -1212,7 +1199,6 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
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impl_item.hir_id(),
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&sig.decl,
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&impl_item.generics,
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sig.header.asyncness,
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|this| intravisit::walk_impl_item(this, impl_item),
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);
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self.missing_named_lifetime_spots.pop();
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@ -2173,15 +2159,11 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
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hir_id: hir::HirId,
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decl: &'tcx hir::FnDecl<'tcx>,
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generics: &'tcx hir::Generics<'tcx>,
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asyncness: hir::IsAsync,
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walk: F,
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) where
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F: for<'b, 'c> FnOnce(&'b mut LifetimeContext<'c, 'tcx>),
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{
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// Async fns need all their lifetime parameters to be early bound.
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if asyncness != hir::IsAsync::Async {
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insert_late_bound_lifetimes(self.map, decl, generics);
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}
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insert_late_bound_lifetimes(self.map, decl, generics);
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// Find the start of nested early scopes, e.g., in methods.
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let mut next_early_index = 0;
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@ -2409,11 +2409,16 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
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let def_id = item_id.def_id.to_def_id();
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match opaque_ty.kind {
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hir::ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => {
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let replace_parent_lifetimes =
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matches!(origin, hir::OpaqueTyOrigin::FnReturn(..));
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self.impl_trait_ty_to_ty(def_id, lifetimes, replace_parent_lifetimes)
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}
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hir::ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => self
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.impl_trait_ty_to_ty(
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def_id,
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lifetimes,
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matches!(
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origin,
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hir::OpaqueTyOrigin::FnReturn(..)
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| hir::OpaqueTyOrigin::AsyncFn(..)
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),
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),
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ref i => bug!("`impl Trait` pointed to non-opaque type?? {:#?}", i),
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}
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}
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@ -545,8 +545,10 @@ pub(super) fn check_opaque_for_inheriting_lifetimes<'tcx>(
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}
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}
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if let ItemKind::OpaqueTy(hir::OpaqueTy { origin: hir::OpaqueTyOrigin::FnReturn(..), .. }) =
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item.kind
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if let ItemKind::OpaqueTy(hir::OpaqueTy {
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origin: hir::OpaqueTyOrigin::AsyncFn(..) | hir::OpaqueTyOrigin::FnReturn(..),
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..
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}) = item.kind
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{
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let mut visitor = ProhibitOpaqueVisitor {
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opaque_identity_ty: tcx.mk_opaque(
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@ -568,13 +570,20 @@ pub(super) fn check_opaque_for_inheriting_lifetimes<'tcx>(
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if let Some(ty) = prohibit_opaque.break_value() {
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visitor.visit_item(&item);
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let is_async = match item.kind {
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ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => {
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matches!(origin, hir::OpaqueTyOrigin::AsyncFn(..))
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}
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_ => unreachable!(),
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};
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let mut err = struct_span_err!(
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tcx.sess,
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span,
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E0760,
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"`impl Trait` return type cannot contain a projection or `Self` that references lifetimes from \
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"`{}` return type cannot contain a projection or `Self` that references lifetimes from \
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a parent scope",
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if is_async { "async fn" } else { "impl Trait" },
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);
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for (span, name) in visitor.selftys {
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|
@ -2157,7 +2157,8 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: DefId) -> ty::GenericP
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generics
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}
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ItemKind::OpaqueTy(OpaqueTy {
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origin: hir::OpaqueTyOrigin::FnReturn(..), ..
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origin: hir::OpaqueTyOrigin::AsyncFn(..) | hir::OpaqueTyOrigin::FnReturn(..),
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..
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}) => {
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// return-position impl trait
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//
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@ -2177,7 +2178,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: DefId) -> ty::GenericP
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}
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ItemKind::OpaqueTy(OpaqueTy {
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ref generics,
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origin: hir::OpaqueTyOrigin::AsyncFn(..) | hir::OpaqueTyOrigin::TyAlias,
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origin: hir::OpaqueTyOrigin::TyAlias,
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..
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}) => {
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// type-alias impl trait
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|
@ -585,12 +585,7 @@ fn clean_ty_generics(
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.params
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.iter()
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.filter_map(|param| match param.kind {
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ty::GenericParamDefKind::Lifetime => {
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if param.name == kw::UnderscoreLifetime {
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return None;
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}
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Some(param.clean(cx))
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}
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ty::GenericParamDefKind::Lifetime => Some(param.clean(cx)),
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ty::GenericParamDefKind::Type { synthetic, .. } => {
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if param.name == kw::SelfUpper {
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assert_eq!(param.index, 0);
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|
@ -8,6 +8,7 @@ pub struct Foo<'a> {
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impl<'a> Foo<'a> {
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pub async fn new(_bar: &'a i32) -> Self {
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//~^ ERROR `async fn` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
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Foo {
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bar: &22
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}
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@ -18,7 +19,6 @@ async fn foo() {
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let x = {
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let bar = 22;
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Foo::new(&bar).await
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//~^ ERROR `bar` does not live long enough [E0597]
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};
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drop(x);
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}
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|
@ -1,15 +1,9 @@
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error[E0597]: `bar` does not live long enough
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--> $DIR/issue-61949-self-return-type.rs:20:18
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error[E0760]: `async fn` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
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--> $DIR/issue-61949-self-return-type.rs:10:40
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|
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LL | let x = {
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| - borrow later stored here
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LL | let bar = 22;
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LL | Foo::new(&bar).await
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| ^^^^ borrowed value does not live long enough
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LL |
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LL | };
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| - `bar` dropped here while still borrowed
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LL | pub async fn new(_bar: &'a i32) -> Self {
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| ^^^^ help: consider spelling out the type instead: `Foo<'a>`
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0597`.
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For more information about this error, try `rustc --explain E0760`.
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|
@ -1,10 +1,14 @@
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error[E0506]: cannot assign to `*x` because it is borrowed
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--> $DIR/issue-74072-lifetime-name-annotations.rs:9:5
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|
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LL | pub async fn async_fn(x: &mut i32) -> &i32 {
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| - let's call the lifetime of this reference `'1`
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LL | let y = &*x;
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| --- borrow of `*x` occurs here
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LL | *x += 1;
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| ^^^^^^^ assignment to borrowed `*x` occurs here
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LL | y
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| - returning this value requires that `*x` is borrowed for `'1`
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error[E0506]: cannot assign to `*x` because it is borrowed
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--> $DIR/issue-74072-lifetime-name-annotations.rs:16:9
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|
@ -1,10 +1,14 @@
|
||||
error[E0506]: cannot assign to `*x` because it is borrowed
|
||||
--> $DIR/issue-75785-confusing-named-region.rs:9:5
|
||||
|
|
||||
LL | pub async fn async_fn(x: &mut i32) -> (&i32, &i32) {
|
||||
| - let's call the lifetime of this reference `'1`
|
||||
LL | let y = &*x;
|
||||
| --- borrow of `*x` occurs here
|
||||
LL | *x += 1;
|
||||
| ^^^^^^^ assignment to borrowed `*x` occurs here
|
||||
LL | (&32, y)
|
||||
| -------- returning this value requires that `*x` is borrowed for `'1`
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
@ -2,10 +2,12 @@ error[E0623]: lifetime mismatch
|
||||
--> $DIR/issue-63388-1.rs:14:9
|
||||
|
|
||||
LL | &'a self, foo: &dyn Foo
|
||||
| -------- -------- these two types are declared with different lifetimes...
|
||||
...
|
||||
| -------- this parameter and the return type are declared with different lifetimes...
|
||||
LL | ) -> &dyn Foo
|
||||
| --------
|
||||
LL | {
|
||||
LL | foo
|
||||
| ^^^ ...but data from `foo` flows into `self` here
|
||||
| ^^^ ...but data from `foo` is returned here
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
@ -1,10 +1,10 @@
|
||||
// check-pass
|
||||
// edition:2018
|
||||
|
||||
struct S<'a>(&'a i32);
|
||||
|
||||
impl<'a> S<'a> {
|
||||
async fn new(i: &'a i32) -> Result<Self, ()> {
|
||||
//~^ ERROR: `async fn`
|
||||
Ok(S(&22))
|
||||
}
|
||||
}
|
||||
|
11
src/test/ui/async-await/issues/issue-78600.stderr
Normal file
11
src/test/ui/async-await/issues/issue-78600.stderr
Normal file
@ -0,0 +1,11 @@
|
||||
error[E0760]: `async fn` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
|
||||
--> $DIR/issue-78600.rs:6:33
|
||||
|
|
||||
LL | async fn new(i: &'a i32) -> Result<Self, ()> {
|
||||
| ^^^^^^^----^^^^^
|
||||
| |
|
||||
| help: consider spelling out the type instead: `S<'a>`
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0760`.
|
@ -1,13 +1,15 @@
|
||||
error: lifetime may not live long enough
|
||||
--> $DIR/ret-impl-trait-one.rs:12:5
|
||||
--> $DIR/ret-impl-trait-one.rs:10:85
|
||||
|
|
||||
LL | async fn async_ret_impl_trait3<'a, 'b>(a: &'a u8, b: &'b u8) -> impl Trait<'a> + 'b {
|
||||
| -- -- lifetime `'b` defined here
|
||||
| |
|
||||
| lifetime `'a` defined here
|
||||
LL |
|
||||
LL | (a, b)
|
||||
| ^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a`
|
||||
LL | async fn async_ret_impl_trait3<'a, 'b>(a: &'a u8, b: &'b u8) -> impl Trait<'a> + 'b {
|
||||
| ________________________________--__--_______________________________________________^
|
||||
| | | |
|
||||
| | | lifetime `'b` defined here
|
||||
| | lifetime `'a` defined here
|
||||
LL | |
|
||||
LL | | (a, b)
|
||||
LL | | }
|
||||
| |_^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a`
|
||||
|
|
||||
= help: consider adding the following bound: `'a: 'b`
|
||||
|
||||
|
@ -2,9 +2,10 @@ error[E0623]: lifetime mismatch
|
||||
--> $DIR/ret-impl-trait-one.rs:10:65
|
||||
|
|
||||
LL | async fn async_ret_impl_trait3<'a, 'b>(a: &'a u8, b: &'b u8) -> impl Trait<'a> + 'b {
|
||||
| ------ ------ ^^^^^^^^^^^^^^^^^^^ ...but data from `a` flows into `b` here
|
||||
| |
|
||||
| these two types are declared with different lifetimes...
|
||||
| ------ ^^^^^^^^^^^^^^^^^^^
|
||||
| | |
|
||||
| | ...but data from `a` is returned here
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
|
||||
error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
|
||||
--> $DIR/ret-impl-trait-one.rs:16:65
|
||||
|
@ -10,13 +10,10 @@
|
||||
// Even wrong cases don't cause errors because async functions are desugared with all lifetimes
|
||||
// involved in the signature. So, we cannot predict what lifetimes are unused in async function.
|
||||
async fn async_wrong_without_args<'a>() {}
|
||||
//~^ ERROR lifetime parameter `'a` never used [unused_lifetimes]
|
||||
|
||||
async fn async_wrong_1_lifetime<'a>(_: &i32) {}
|
||||
//~^ ERROR lifetime parameter `'a` never used [unused_lifetimes]
|
||||
|
||||
async fn async_wrong_2_lifetimes<'a, 'b>(_: &'a i32, _: &i32) {}
|
||||
//~^ ERROR lifetime parameter `'b` never used [unused_lifetimes]
|
||||
|
||||
async fn async_right_1_lifetime<'a>(_: &'a i32) {}
|
||||
|
||||
|
@ -1,8 +1,8 @@
|
||||
error: lifetime parameter `'a` never used
|
||||
--> $DIR/unused-lifetime.rs:12:35
|
||||
--> $DIR/unused-lifetime.rs:31:23
|
||||
|
|
||||
LL | async fn async_wrong_without_args<'a>() {}
|
||||
| -^^- help: elide the unused lifetime
|
||||
LL | fn wrong_without_args<'a>() {}
|
||||
| -^^- help: elide the unused lifetime
|
||||
|
|
||||
note: the lint level is defined here
|
||||
--> $DIR/unused-lifetime.rs:5:9
|
||||
@ -11,40 +11,18 @@ LL | #![deny(unused_lifetimes)]
|
||||
| ^^^^^^^^^^^^^^^^
|
||||
|
||||
error: lifetime parameter `'a` never used
|
||||
--> $DIR/unused-lifetime.rs:15:33
|
||||
|
|
||||
LL | async fn async_wrong_1_lifetime<'a>(_: &i32) {}
|
||||
| ^^-----
|
||||
| |
|
||||
| help: elide the unused lifetime
|
||||
|
||||
error: lifetime parameter `'b` never used
|
||||
--> $DIR/unused-lifetime.rs:18:38
|
||||
|
|
||||
LL | async fn async_wrong_2_lifetimes<'a, 'b>(_: &'a i32, _: &i32) {}
|
||||
| ^^-----------------
|
||||
| |
|
||||
| help: elide the unused lifetime
|
||||
|
||||
error: lifetime parameter `'a` never used
|
||||
--> $DIR/unused-lifetime.rs:34:23
|
||||
|
|
||||
LL | fn wrong_without_args<'a>() {}
|
||||
| -^^- help: elide the unused lifetime
|
||||
|
||||
error: lifetime parameter `'a` never used
|
||||
--> $DIR/unused-lifetime.rs:36:21
|
||||
--> $DIR/unused-lifetime.rs:33:21
|
||||
|
|
||||
LL | fn wrong_1_lifetime<'a>(_: &i32) {}
|
||||
| -^^- help: elide the unused lifetime
|
||||
|
||||
error: lifetime parameter `'b` never used
|
||||
--> $DIR/unused-lifetime.rs:38:26
|
||||
--> $DIR/unused-lifetime.rs:35:26
|
||||
|
|
||||
LL | fn wrong_2_lifetimes<'a, 'b>(_: &'a i32, _: &i32) {}
|
||||
| --^^
|
||||
| |
|
||||
| help: elide the unused lifetime
|
||||
|
||||
error: aborting due to 6 previous errors
|
||||
error: aborting due to 3 previous errors
|
||||
|
||||
|
@ -1,9 +1,10 @@
|
||||
error[E0515]: cannot return value referencing local variable `raw_lines`
|
||||
--> $DIR/drop-with-active-borrows-2.rs:3:30
|
||||
--> $DIR/drop-with-active-borrows-2.rs:3:5
|
||||
|
|
||||
LL | raw_lines.iter().map(|l| l.trim()).collect()
|
||||
| ---------------- ^^^^^^^^ returns a value referencing data owned by the current function
|
||||
| ----------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
| |
|
||||
| returns a value referencing data owned by the current function
|
||||
| `raw_lines` is borrowed here
|
||||
|
||||
error: aborting due to previous error
|
||||
|
@ -1,7 +1,7 @@
|
||||
fn read_lines_borrowed<'a>() -> Vec<&'a str> {
|
||||
let rawLines: Vec<String> = vec!["foo ".to_string(), " bar".to_string()];
|
||||
rawLines.iter().map(|l| l.trim()).collect()
|
||||
//~^ ERROR cannot return value referencing local variable `rawLines`
|
||||
rawLines //~ ERROR cannot return value referencing local variable `rawLines`
|
||||
.iter().map(|l| l.trim()).collect()
|
||||
}
|
||||
|
||||
fn main() {}
|
||||
|
@ -1,10 +1,14 @@
|
||||
error[E0515]: cannot return value referencing local variable `rawLines`
|
||||
--> $DIR/issue-13497-2.rs:3:29
|
||||
--> $DIR/issue-13497-2.rs:3:5
|
||||
|
|
||||
LL | rawLines.iter().map(|l| l.trim()).collect()
|
||||
| --------------- ^^^^^^^^ returns a value referencing data owned by the current function
|
||||
| |
|
||||
| `rawLines` is borrowed here
|
||||
LL | rawLines
|
||||
| _____^
|
||||
| |_____|
|
||||
| ||
|
||||
LL | || .iter().map(|l| l.trim()).collect()
|
||||
| ||_______________-___________________________^ returns a value referencing data owned by the current function
|
||||
| |________________|
|
||||
| `rawLines` is borrowed here
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
|
@ -20,8 +20,9 @@ error: lifetime may not live long enough
|
||||
--> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:17:64
|
||||
|
|
||||
LL | async fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> &() { arg }
|
||||
| -- ---- has type `Pin<&'1 Foo>` ^^^ associated function was supposed to return data with lifetime `'1` but it is returning data with lifetime `'a`
|
||||
| |
|
||||
| -- - ^^^ associated function was supposed to return data with lifetime `'1` but it is returning data with lifetime `'a`
|
||||
| | |
|
||||
| | let's call the lifetime of this reference `'1`
|
||||
| lifetime `'a` defined here
|
||||
|
||||
error: aborting due to 3 previous errors
|
||||
|
@ -2,25 +2,25 @@ error[E0623]: lifetime mismatch
|
||||
--> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:8:52
|
||||
|
|
||||
LL | async fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
|
||||
| ---- ---- ^ ...but data from `f` flows into `self` here
|
||||
| ---- ---- ^ ...but data from `f` is returned here
|
||||
| |
|
||||
| these two types are declared with different lifetimes...
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:11:82
|
||||
|
|
||||
LL | async fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
|
||||
| ----- ---- ^ ...but data from `f` flows into `self` here
|
||||
| ---- ----------------- ^ ...but data from `f` is returned here
|
||||
| |
|
||||
| these two types are declared with different lifetimes...
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/arbitrary_self_types_pin_lifetime_mismatch-async.rs:17:64
|
||||
|
|
||||
LL | async fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> &() { arg }
|
||||
| ----- ------ ^^^ ...but data from `arg` flows into `self` here
|
||||
| ------ --- ^^^ ...but data from `arg` is returned here
|
||||
| |
|
||||
| these two types are declared with different lifetimes...
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
|
||||
error: aborting due to 3 previous errors
|
||||
|
||||
|
@ -2,49 +2,61 @@ error[E0623]: lifetime mismatch
|
||||
--> $DIR/lt-ref-self-async.rs:13:9
|
||||
|
|
||||
LL | async fn ref_self(&self, f: &u32) -> &u32 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/lt-ref-self-async.rs:19:9
|
||||
|
|
||||
LL | async fn ref_Self(self: &Self, f: &u32) -> &u32 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/lt-ref-self-async.rs:23:9
|
||||
|
|
||||
LL | async fn box_ref_Self(self: Box<&Self>, f: &u32) -> &u32 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/lt-ref-self-async.rs:27:9
|
||||
|
|
||||
LL | async fn pin_ref_Self(self: Pin<&Self>, f: &u32) -> &u32 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/lt-ref-self-async.rs:31:9
|
||||
|
|
||||
LL | async fn box_box_ref_Self(self: Box<Box<&Self>>, f: &u32) -> &u32 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/lt-ref-self-async.rs:35:9
|
||||
|
|
||||
LL | async fn box_pin_Self(self: Box<Pin<&Self>>, f: &u32) -> &u32 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error: aborting due to 6 previous errors
|
||||
|
||||
|
@ -2,49 +2,61 @@ error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-self-async.rs:13:9
|
||||
|
|
||||
LL | async fn ref_self(&mut self, f: &u32) -> &u32 {
|
||||
| --------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-self-async.rs:19:9
|
||||
|
|
||||
LL | async fn ref_Self(self: &mut Self, f: &u32) -> &u32 {
|
||||
| --------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-self-async.rs:23:9
|
||||
|
|
||||
LL | async fn box_ref_Self(self: Box<&mut Self>, f: &u32) -> &u32 {
|
||||
| --------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| --------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| --------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| --------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error: aborting due to 6 previous errors
|
||||
|
||||
|
@ -2,41 +2,51 @@ error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-mut-struct-async.rs:13:9
|
||||
|
|
||||
LL | async fn ref_Struct(self: &mut Struct, f: &u32) -> &u32 {
|
||||
| ----------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| ----------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| ----------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| ----------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| ----------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error: aborting due to 5 previous errors
|
||||
|
||||
|
@ -2,57 +2,71 @@ error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-self-async.rs:23:9
|
||||
|
|
||||
LL | async fn ref_self(&self, f: &u32) -> &u32 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-self-async.rs:29:9
|
||||
|
|
||||
LL | async fn ref_Self(self: &Self, f: &u32) -> &u32 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-self-async.rs:33:9
|
||||
|
|
||||
LL | async fn box_ref_Self(self: Box<&Self>, f: &u32) -> &u32 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-self-async.rs:37:9
|
||||
|
|
||||
LL | async fn pin_ref_Self(self: Pin<&Self>, f: &u32) -> &u32 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| ----- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| ----- --- these two types are declared with different lifetimes...
|
||||
| --- ---
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error: aborting due to 7 previous errors
|
||||
|
||||
|
@ -2,41 +2,51 @@ error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-struct-async.rs:13:9
|
||||
|
|
||||
LL | async fn ref_Struct(self: &Struct, f: &u32) -> &u32 {
|
||||
| ------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-struct-async.rs:17:9
|
||||
|
|
||||
LL | async fn box_ref_Struct(self: Box<&Struct>, f: &u32) -> &u32 {
|
||||
| ------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error[E0623]: lifetime mismatch
|
||||
--> $DIR/ref-struct-async.rs:21:9
|
||||
|
|
||||
LL | async fn pin_ref_Struct(self: Pin<&Struct>, f: &u32) -> &u32 {
|
||||
| ------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| ------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned 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 {
|
||||
| ------- ---- these two types are declared with different lifetimes...
|
||||
| ---- ----
|
||||
| |
|
||||
| this parameter and the return type are declared with different lifetimes...
|
||||
LL | f
|
||||
| ^ ...but data from `f` flows into `self` here
|
||||
| ^ ...but data from `f` is returned here
|
||||
|
||||
error: aborting due to 5 previous errors
|
||||
|
||||
|
@ -80,7 +80,6 @@ fn elided_not_bound(_: &i32) -> impl Future<Output = i32> {
|
||||
async { 42 }
|
||||
}
|
||||
|
||||
#[allow(clippy::needless_lifetimes)]
|
||||
async fn explicit<'a, 'b>(_: &'a i32, _: &'b i32) -> i32 { 42 }
|
||||
|
||||
// should be ignored
|
||||
|
@ -98,7 +98,6 @@ fn elided_not_bound(_: &i32) -> impl Future<Output = i32> {
|
||||
async { 42 }
|
||||
}
|
||||
|
||||
#[allow(clippy::needless_lifetimes)]
|
||||
fn explicit<'a, 'b>(_: &'a i32, _: &'b i32) -> impl Future<Output = i32> + 'a + 'b {
|
||||
async { 42 }
|
||||
}
|
||||
|
@ -140,7 +140,7 @@ LL | fn elided(_: &i32) -> impl Future<Output = i32> + '_ { 42 }
|
||||
| ~~~~~~
|
||||
|
||||
error: this function can be simplified using the `async fn` syntax
|
||||
--> $DIR/manual_async_fn.rs:102:1
|
||||
--> $DIR/manual_async_fn.rs:101:1
|
||||
|
|
||||
LL | fn explicit<'a, 'b>(_: &'a i32, _: &'b i32) -> impl Future<Output = i32> + 'a + 'b {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
@ -18,12 +18,6 @@ error: explicit lifetimes given in parameter types where they could be elided (o
|
||||
LL | fn in_and_out<'a>(x: &'a u8, _y: u8) -> &'a u8 {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
|
||||
--> $DIR/needless_lifetimes.rs:37:1
|
||||
|
|
||||
LL | async fn func<'a>(args: &[&'a str]) -> Option<&'a str> {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
|
||||
--> $DIR/needless_lifetimes.rs:56:1
|
||||
|
|
||||
@ -198,5 +192,5 @@ error: explicit lifetimes given in parameter types where they could be elided (o
|
||||
LL | fn lifetime_elsewhere_provided<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: aborting due to 33 previous errors
|
||||
error: aborting due to 32 previous errors
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user