Revert "Auto merge of #91403 - cjgillot:inherit-async, r=oli-obk"

This reverts commit 3cfa4def7c, reversing
changes made to 5d8767cb22.
This commit is contained in:
Oli Scherer 2022-02-17 16:00:04 +00:00
parent 30b3f35c42
commit 86d17b98f2
34 changed files with 281 additions and 227 deletions

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@ -1659,12 +1659,11 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
// When we create the opaque type for this async fn, it is going to have
// to capture all the lifetimes involved in the signature (including in the
// return type). This is done by:
// return type). This is done by introducing lifetime parameters for:
//
// - making the opaque type inherit all lifetime parameters from its parent;
// - make all the elided lifetimes in the fn arguments into parameters;
// - manually introducing parameters on the opaque type for elided
// lifetimes in the return type.
// - all the explicitly declared lifetimes from the impl and function itself;
// - all the elided lifetimes in the fn arguments;
// - all the elided lifetimes in the return type.
//
// So for example in this snippet:
//
@ -1680,14 +1679,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
// we would create an opaque type like:
//
// ```
// type Foo<'a>::bar<'b, '0, '1>::Bar<'2> = impl Future<Output = &'2 u32>;
// type Bar<'a, 'b, '0, '1, '2> = impl Future<Output = &'2 u32>;
// ```
//
// and we would then desugar `bar` to the equivalent of:
//
// ```rust
// impl<'a> Foo<'a> {
// fn bar<'b, '0, '1>(&'0 self, x: &'b Vec<f64>, y: &'1 str) -> Bar<'_>
// fn bar<'b, '0, '1>(&'0 self, x: &'b Vec<f64>, y: &'1 str) -> Bar<'a, 'b, '0, '1, '_>
// }
// ```
//
@ -1695,7 +1694,29 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
// this is because the elided lifetimes from the return type
// should be figured out using the ordinary elision rules, and
// this desugaring achieves that.
let mut lifetime_params = Vec::new();
debug!("lower_async_fn_ret_ty: in_scope_lifetimes={:#?}", self.in_scope_lifetimes);
debug!("lower_async_fn_ret_ty: lifetimes_to_define={:#?}", self.lifetimes_to_define);
// Calculate all the lifetimes that should be captured
// by the opaque type. This should include all in-scope
// lifetime parameters, including those defined in-band.
//
// `lifetime_params` is a vector of tuple (span, parameter name, lifetime name).
// Input lifetime like `'a` or `'1`:
let mut lifetime_params: Vec<_> = self
.in_scope_lifetimes
.iter()
.cloned()
.map(|name| (name.ident().span, name, hir::LifetimeName::Param(name)))
.chain(
self.lifetimes_to_define
.iter()
.map(|&(span, name)| (span, name, hir::LifetimeName::Param(name))),
)
.collect();
self.with_hir_id_owner(opaque_ty_node_id, |this| {
// We have to be careful to get elision right here. The
// idea is that we create a lifetime parameter for each
@ -1714,12 +1735,16 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
debug!("lower_async_fn_ret_ty: future_bound={:#?}", future_bound);
debug!("lower_async_fn_ret_ty: lifetimes_to_define={:#?}", lifetimes_to_define);
// Output lifetime like `'_`:
lifetime_params = lifetimes_to_define;
lifetime_params.extend(
// Output lifetime like `'_`:
lifetimes_to_define
.into_iter()
.map(|(span, name)| (span, name, hir::LifetimeName::Implicit(false))),
);
debug!("lower_async_fn_ret_ty: lifetime_params={:#?}", lifetime_params);
let generic_params =
this.arena.alloc_from_iter(lifetime_params.iter().map(|&(span, hir_name)| {
this.arena.alloc_from_iter(lifetime_params.iter().map(|&(span, hir_name, _)| {
this.lifetime_to_generic_param(span, hir_name, opaque_ty_def_id)
}));
@ -1737,22 +1762,28 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
this.generate_opaque_type(opaque_ty_def_id, opaque_ty_item, span, opaque_ty_span)
});
// We need to create the lifetime arguments to our opaque type.
// Continuing with our example, we're creating the type arguments
// for the return type:
// As documented above on the variable
// `input_lifetimes_count`, we need to create the lifetime
// arguments to our opaque type. Continuing with our example,
// we're creating the type arguments for the return type:
//
// ```
// For<'a>::bar<'b, '0, '1>::Bar<'_>
// Bar<'a, 'b, '0, '1, '_>
// ```
//
// For the "input" lifetime parameters are inherited automatically.
// For the "output" lifetime parameters, we just want to generate `'_`.
// For the "input" lifetime parameters, we wish to create
// references to the parameters themselves, including the
// "implicit" ones created from parameter types (`'a`, `'b`,
// '`0`, `'1`).
//
// For the "output" lifetime parameters, we just want to
// generate `'_`.
let generic_args =
self.arena.alloc_from_iter(lifetime_params.into_iter().map(|(span, _)| {
self.arena.alloc_from_iter(lifetime_params.into_iter().map(|(span, _, name)| {
GenericArg::Lifetime(hir::Lifetime {
hir_id: self.next_id(),
span: self.lower_span(span),
name: hir::LifetimeName::Implicit(false),
name,
})
}));

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@ -2156,24 +2156,6 @@ impl<'tcx> RegionInferenceContext<'tcx> {
}
}
// When in async fn, prefer errors that come from inside the closure.
if !categorized_path[i].from_closure {
let span = categorized_path.iter().find_map(|p| {
if p.from_closure
&& p.category == categorized_path[i].category
&& categorized_path[i].cause.span.contains(p.cause.span)
{
Some(p.cause.span)
} else {
None
}
});
if let Some(span) = span {
categorized_path[i].cause.span = span;
}
}
return categorized_path[i].clone();
}

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@ -1,4 +1,4 @@
`impl trait` return type cannot contain a projection
`async fn`/`impl trait` return type cannot contain a projection
or `Self` that references lifetimes from a parent scope.
Erroneous code example:
@ -7,7 +7,7 @@ Erroneous code example:
struct S<'a>(&'a i32);
impl<'a> S<'a> {
fn new(i: &'a i32) -> impl Into<Self> {
async fn new(i: &'a i32) -> Self {
S(&22)
}
}
@ -19,7 +19,7 @@ To fix this error we need to spell out `Self` to `S<'a>`:
struct S<'a>(&'a i32);
impl<'a> S<'a> {
fn new(i: &'a i32) -> impl Into<S<'a>> {
async fn new(i: &'a i32) -> S<'a> {
S(&22)
}
}

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@ -276,7 +276,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
debug!(?concrete_ty);
let first_own_region = match opaque_defn.origin {
hir::OpaqueTyOrigin::FnReturn(..) => {
hir::OpaqueTyOrigin::FnReturn(..) | hir::OpaqueTyOrigin::AsyncFn(..) => {
// We lower
//
// fn foo<'l0..'ln>() -> impl Trait<'l0..'lm>
@ -291,7 +291,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
}
// These opaque type inherit all lifetime parameters from their
// parent, so we have to check them all.
hir::OpaqueTyOrigin::AsyncFn(..) | hir::OpaqueTyOrigin::TyAlias => 0,
hir::OpaqueTyOrigin::TyAlias => 0,
};
// 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> {
match item.kind {
hir::ItemKind::Fn(ref sig, ref generics, _) => {
self.missing_named_lifetime_spots.push(generics.into());
self.visit_early_late(
None,
item.hir_id(),
&sig.decl,
generics,
sig.header.asyncness,
|this| {
intravisit::walk_item(this, item);
},
);
self.visit_early_late(None, item.hir_id(), &sig.decl, generics, |this| {
intravisit::walk_item(this, item);
});
self.missing_named_lifetime_spots.pop();
}
@ -856,16 +849,11 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
fn visit_foreign_item(&mut self, item: &'tcx hir::ForeignItem<'tcx>) {
match item.kind {
hir::ForeignItemKind::Fn(ref decl, _, ref generics) => self.visit_early_late(
None,
item.hir_id(),
decl,
generics,
hir::IsAsync::NotAsync,
|this| {
hir::ForeignItemKind::Fn(ref decl, _, ref generics) => {
self.visit_early_late(None, item.hir_id(), decl, generics, |this| {
intravisit::walk_foreign_item(this, item);
},
),
})
}
hir::ForeignItemKind::Static(..) => {
intravisit::walk_foreign_item(self, item);
}
@ -1142,7 +1130,6 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
trait_item.hir_id(),
&sig.decl,
&trait_item.generics,
sig.header.asyncness,
|this| intravisit::walk_trait_item(this, trait_item),
);
self.missing_named_lifetime_spots.pop();
@ -1212,7 +1199,6 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
impl_item.hir_id(),
&sig.decl,
&impl_item.generics,
sig.header.asyncness,
|this| intravisit::walk_impl_item(this, impl_item),
);
self.missing_named_lifetime_spots.pop();
@ -2173,15 +2159,11 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
hir_id: hir::HirId,
decl: &'tcx hir::FnDecl<'tcx>,
generics: &'tcx hir::Generics<'tcx>,
asyncness: hir::IsAsync,
walk: F,
) where
F: for<'b, 'c> FnOnce(&'b mut LifetimeContext<'c, 'tcx>),
{
// Async fns need all their lifetime parameters to be early bound.
if asyncness != hir::IsAsync::Async {
insert_late_bound_lifetimes(self.map, decl, generics);
}
insert_late_bound_lifetimes(self.map, decl, generics);
// Find the start of nested early scopes, e.g., in methods.
let mut next_early_index = 0;

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@ -2409,11 +2409,16 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
let def_id = item_id.def_id.to_def_id();
match opaque_ty.kind {
hir::ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => {
let replace_parent_lifetimes =
matches!(origin, hir::OpaqueTyOrigin::FnReturn(..));
self.impl_trait_ty_to_ty(def_id, lifetimes, replace_parent_lifetimes)
}
hir::ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => self
.impl_trait_ty_to_ty(
def_id,
lifetimes,
matches!(
origin,
hir::OpaqueTyOrigin::FnReturn(..)
| hir::OpaqueTyOrigin::AsyncFn(..)
),
),
ref i => bug!("`impl Trait` pointed to non-opaque type?? {:#?}", i),
}
}

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@ -545,8 +545,10 @@ pub(super) fn check_opaque_for_inheriting_lifetimes<'tcx>(
}
}
if let ItemKind::OpaqueTy(hir::OpaqueTy { origin: hir::OpaqueTyOrigin::FnReturn(..), .. }) =
item.kind
if let ItemKind::OpaqueTy(hir::OpaqueTy {
origin: hir::OpaqueTyOrigin::AsyncFn(..) | hir::OpaqueTyOrigin::FnReturn(..),
..
}) = item.kind
{
let mut visitor = ProhibitOpaqueVisitor {
opaque_identity_ty: tcx.mk_opaque(
@ -568,13 +570,20 @@ pub(super) fn check_opaque_for_inheriting_lifetimes<'tcx>(
if let Some(ty) = prohibit_opaque.break_value() {
visitor.visit_item(&item);
let is_async = match item.kind {
ItemKind::OpaqueTy(hir::OpaqueTy { origin, .. }) => {
matches!(origin, hir::OpaqueTyOrigin::AsyncFn(..))
}
_ => unreachable!(),
};
let mut err = struct_span_err!(
tcx.sess,
span,
E0760,
"`impl Trait` return type cannot contain a projection or `Self` that references lifetimes from \
"`{}` return type cannot contain a projection or `Self` that references lifetimes from \
a parent scope",
if is_async { "async fn" } else { "impl Trait" },
);
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
generics
}
ItemKind::OpaqueTy(OpaqueTy {
origin: hir::OpaqueTyOrigin::FnReturn(..), ..
origin: hir::OpaqueTyOrigin::AsyncFn(..) | hir::OpaqueTyOrigin::FnReturn(..),
..
}) => {
// return-position impl trait
//
@ -2177,7 +2178,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: DefId) -> ty::GenericP
}
ItemKind::OpaqueTy(OpaqueTy {
ref generics,
origin: hir::OpaqueTyOrigin::AsyncFn(..) | hir::OpaqueTyOrigin::TyAlias,
origin: hir::OpaqueTyOrigin::TyAlias,
..
}) => {
// type-alias impl trait

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@ -585,12 +585,7 @@ fn clean_ty_generics(
.params
.iter()
.filter_map(|param| match param.kind {
ty::GenericParamDefKind::Lifetime => {
if param.name == kw::UnderscoreLifetime {
return None;
}
Some(param.clean(cx))
}
ty::GenericParamDefKind::Lifetime => Some(param.clean(cx)),
ty::GenericParamDefKind::Type { synthetic, .. } => {
if param.name == kw::SelfUpper {
assert_eq!(param.index, 0);

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@ -8,6 +8,7 @@ pub struct Foo<'a> {
impl<'a> Foo<'a> {
pub async fn new(_bar: &'a i32) -> Self {
//~^ ERROR `async fn` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
Foo {
bar: &22
}
@ -18,7 +19,6 @@ async fn foo() {
let x = {
let bar = 22;
Foo::new(&bar).await
//~^ ERROR `bar` does not live long enough [E0597]
};
drop(x);
}

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@ -1,15 +1,9 @@
error[E0597]: `bar` does not live long enough
--> $DIR/issue-61949-self-return-type.rs:20:18
error[E0760]: `async fn` return type cannot contain a projection or `Self` that references lifetimes from a parent scope
--> $DIR/issue-61949-self-return-type.rs:10:40
|
LL | let x = {
| - borrow later stored here
LL | let bar = 22;
LL | Foo::new(&bar).await
| ^^^^ borrowed value does not live long enough
LL |
LL | };
| - `bar` dropped here while still borrowed
LL | pub async fn new(_bar: &'a i32) -> Self {
| ^^^^ help: consider spelling out the type instead: `Foo<'a>`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0597`.
For more information about this error, try `rustc --explain E0760`.

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@ -1,10 +1,14 @@
error[E0506]: cannot assign to `*x` because it is borrowed
--> $DIR/issue-74072-lifetime-name-annotations.rs:9:5
|
LL | pub async fn async_fn(x: &mut 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 | y
| - returning this value requires that `*x` is borrowed for `'1`
error[E0506]: cannot assign to `*x` because it is borrowed
--> $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

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@ -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

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@ -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))
}
}

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@ -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`.

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@ -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`

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@ -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

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@ -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) {}

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@ -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

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@ -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

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@ -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() {}

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@ -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

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@ -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

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@ -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

View File

@ -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

View File

@ -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

View File

@ -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

View File

@ -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

View File

@ -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

View File

@ -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

View File

@ -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 }
}

View File

@ -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 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

View File

@ -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