Correctly provide suggestions when encountering `async fn` with a `dyn Trait` return type #148491

estebank · 2025-11-04T18:13:07Z

Point at return type of async fns instead of their def Span.

Correctly provide suggestions when encountering async fn with a dyn Trait return type.

Correctly address type Alias = dyn Trait when fn foo() -> Alias { .. }.

…uggestion

rustbot · 2025-11-04T18:13:12Z

rustbot has assigned @jackh726.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

``` error[E0277]: the size for values of type `(dyn Debug + 'static)` cannot be known at compilation time --> $DIR/dyn-trait-type-alias-return-type.rs:4:11 | LL | fn f() -> T { loop {} } | ^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `(dyn Debug + 'static)` note: this type alias is unsized --> $DIR/dyn-trait-type-alias-return-type.rs:1:1 | LL | type T = dyn core::fmt::Debug; | ^^^^^^ = note: the return type of a function must have a statically known size ```

rust-log-analyzer · 2025-11-04T23:16:50Z

The job x86_64-gnu-tools failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

tests/ui/size_of_in_element_count/functions.rs ... ok
tests/ui/crashes/third-party/conf_allowlisted.rs ... ok

FAILED TEST: tests/ui/future_not_send.rs
command: CLIPPY_CONF_DIR="tests" RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/clippy-driver" "--error-format=json" "--emit=metadata" "-Aunused" "-Ainternal_features" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Dwarnings" "-Ldependency=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/release/deps" "--sysroot=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/ui_test/0/tests/ui" "tests/ui/future_not_send.rs" "--extern" "futures=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libfutures-a8bf6f69c9b80e37.rlib" "--extern" "futures=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libfutures-a8bf6f69c9b80e37.rmeta" "--extern" "itertools=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libitertools-2d82d3ce68d9c3ee.rlib" "--extern" "itertools=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libitertools-2d82d3ce68d9c3ee.rmeta" "--extern" "libc=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/liblibc-e86cd1a7c22fc60c.rlib" "--extern" "libc=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/liblibc-e86cd1a7c22fc60c.rmeta" "--extern" "parking_lot=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libparking_lot-a94abfa769f04e5d.rlib" "--extern" "parking_lot=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libparking_lot-a94abfa769f04e5d.rmeta" "--extern" "quote=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libquote-22b65b7753b00e23.rlib" "--extern" "quote=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libquote-22b65b7753b00e23.rmeta" "--extern" "regex=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libregex-4368476ea091f8ef.rlib" "--extern" "regex=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libregex-4368476ea091f8ef.rmeta" "--extern" "serde=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libserde-978a92b8a77cdf3d.rlib" "--extern" "serde=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libserde-978a92b8a77cdf3d.rmeta" "--extern" "syn=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libsyn-fdddf18d670fbd00.rlib" "--extern" "syn=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libsyn-fdddf18d670fbd00.rmeta" "--extern" "tokio=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libtokio-1fc6a815de90452d.rlib" "--extern" "tokio=/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps/libtokio-1fc6a815de90452d.rmeta" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/debug/deps" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/debug/deps" "--edition" "2024"

error: actual output differed from expected
Execute `./x test src/tools/clippy --bless` to update `tests/ui/future_not_send.stderr` to the actual output
--- tests/ui/future_not_send.stderr
+++ <stderr output>
 error: future cannot be sent between threads safely
-  --> tests/ui/future_not_send.rs:8:1
+  --> tests/ui/future_not_send.rs:8:62
    |
 LL | async fn private_future(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `private_future` is not `Send`
+   |                                                              ^^^^ future returned by `private_future` is not `Send`
    |
 note: future is not `Send` as this value is used across an await
... 16 lines skipped ...
 
 error: future cannot be sent between threads safely
-  --> tests/ui/future_not_send.rs:14:1
+  --> tests/ui/future_not_send.rs:14:41
    |
 LL | pub async fn public_future(rc: Rc<[u8]>) {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `public_future` is not `Send`
+   |                                         ^ future returned by `public_future` is not `Send`
    |
 note: future is not `Send` as this value is used across an await
... 8 lines skipped ...
 
 error: future cannot be sent between threads safely
-  --> tests/ui/future_not_send.rs:24:1
+  --> tests/ui/future_not_send.rs:24:63
    |
 LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `private_future2` is not `Send`
+   |                                                               ^^^^ future returned by `private_future2` is not `Send`
    |
 note: captured value is not `Send`
... 11 lines skipped ...
 
 error: future cannot be sent between threads safely
-  --> tests/ui/future_not_send.rs:30:1
+  --> tests/ui/future_not_send.rs:30:42
    |
 LL | pub async fn public_future2(rc: Rc<[u8]>) {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `public_future2` is not `Send`
+   |                                          ^ future returned by `public_future2` is not `Send`
    |
 note: captured value is not `Send`
... 5 lines skipped ...
 
 error: future cannot be sent between threads safely
---
-  --> tests/ui/future_not_send.rs:49:5
+  --> tests/ui/future_not_send.rs:49:38
    |
 LL |     pub async fn public_future(&self) {
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `public_future` is not `Send`
+   |                                      ^ future returned by `public_future` is not `Send`
    |
 note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
... 5 lines skipped ...
 
 error: future cannot be sent between threads safely
---
    |
-LL | / async fn generic_future<T>(t: T) -> T
-LL | |
-LL | | where
-LL | |     T: Send,
-   | |____________^ future returned by `generic_future` is not `Send`
+LL | async fn generic_future<T>(t: T) -> T
+   |                                     ^ future returned by `generic_future` is not `Send`
    |
 note: future is not `Send` as this value is used across an await
... 7 lines skipped ...
 
 error: future cannot be sent between threads safely
-  --> tests/ui/future_not_send.rs:83:1
+  --> tests/ui/future_not_send.rs:83:51
    |
 LL | async fn generic_future_always_unsend<T>(_: Rc<T>) {
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `generic_future_always_unsend` is not `Send`
+   |                                                   ^ future returned by `generic_future_always_unsend` is not `Send`
    |
 note: future is not `Send` as this value is used across an await
... 9 lines skipped ...
 error: aborting due to 8 previous errors
 

Full unnormalized output:
error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:8:62
   |
LL | async fn private_future(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                                                              ^^^^ future returned by `private_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> tests/ui/future_not_send.rs:11:20
   |
LL | async fn private_future(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                         -- has type `std::rc::Rc<[u8]>` which is not `Send`
...
LL |     async { true }.await
   |                    ^^^^^ await occurs here, with `rc` maybe used later
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`
note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
  --> tests/ui/future_not_send.rs:8:39
   |
LL | async fn private_future(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                                       ^^^^ has type `&std::cell::Cell<usize>` which is not `Send`, because `std::cell::Cell<usize>` is not `Sync`
   = note: `std::cell::Cell<usize>` doesn't implement `std::marker::Sync`
   = note: `-D clippy::future-not-send` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::future_not_send)]`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:14:41
   |
LL | pub async fn public_future(rc: Rc<[u8]>) {
   |                                         ^ future returned by `public_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> tests/ui/future_not_send.rs:17:20
   |
LL | pub async fn public_future(rc: Rc<[u8]>) {
   |                            -- has type `std::rc::Rc<[u8]>` which is not `Send`
...
LL |     async { true }.await;
   |                    ^^^^^ await occurs here, with `rc` maybe used later
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:24:63
   |
LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                                                               ^^^^ future returned by `private_future2` is not `Send`
   |
note: captured value is not `Send`
  --> tests/ui/future_not_send.rs:24:26
   |
LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                          ^^ has type `std::rc::Rc<[u8]>` which is not `Send`
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`
note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
  --> tests/ui/future_not_send.rs:24:40
   |
LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                                        ^^^^ has type `&std::cell::Cell<usize>` which is not `Send`, because `std::cell::Cell<usize>` is not `Sync`
   = note: `std::cell::Cell<usize>` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:30:42
   |
LL | pub async fn public_future2(rc: Rc<[u8]>) {}
   |                                          ^ future returned by `public_future2` is not `Send`
   |
note: captured value is not `Send`
  --> tests/ui/future_not_send.rs:30:29
   |
LL | pub async fn public_future2(rc: Rc<[u8]>) {}
   |                             ^^ has type `std::rc::Rc<[u8]>` which is not `Send`
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:42:39
   |
LL |     async fn private_future(&self) -> usize {
   |                                       ^^^^^ future returned by `private_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> tests/ui/future_not_send.rs:45:24
   |
LL |     async fn private_future(&self) -> usize {
   |                             ----- has type `&Dummy` which is not `Send`
...
LL |         async { true }.await;
   |                        ^^^^^ await occurs here, with `&self` maybe used later
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:49:38
   |
LL |     pub async fn public_future(&self) {
   |                                      ^ future returned by `public_future` is not `Send`
   |
note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
  --> tests/ui/future_not_send.rs:49:32
   |
LL |     pub async fn public_future(&self) {
   |                                ^^^^^ has type `&Dummy` which is not `Send`, because `Dummy` is not `Sync`
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:61:37
   |
LL | async fn generic_future<T>(t: T) -> T
   |                                     ^ future returned by `generic_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> tests/ui/future_not_send.rs:67:20
   |
LL |     let rt = &t;
   |         -- has type `&T` which is not `Send`
LL |     async { true }.await;
   |                    ^^^^^ await occurs here, with `rt` maybe used later
   = note: `T` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:83:51
   |
LL | async fn generic_future_always_unsend<T>(_: Rc<T>) {
   |                                                   ^ future returned by `generic_future_always_unsend` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> tests/ui/future_not_send.rs:86:20
   |
LL | async fn generic_future_always_unsend<T>(_: Rc<T>) {
   |                                          - has type `std::rc::Rc<T>` which is not `Send`
...
LL |     async { true }.await;
   |                    ^^^^^ await occurs here, with `_` maybe used later
   = note: `std::rc::Rc<T>` doesn't implement `std::marker::Send`

error: aborting due to 8 previous errors



full stderr:
error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:8:62
   |
LL | async fn private_future(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                                                              ^^^^ future returned by `private_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> tests/ui/future_not_send.rs:11:20
   |
LL | async fn private_future(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                         -- has type `std::rc::Rc<[u8]>` which is not `Send`
...
LL |     async { true }.await
   |                    ^^^^^ await occurs here, with `rc` maybe used later
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`
note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
  --> tests/ui/future_not_send.rs:8:39
   |
LL | async fn private_future(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                                       ^^^^ has type `&std::cell::Cell<usize>` which is not `Send`, because `std::cell::Cell<usize>` is not `Sync`
   = note: `std::cell::Cell<usize>` doesn't implement `std::marker::Sync`
   = note: `-D clippy::future-not-send` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::future_not_send)]`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:14:41
   |
LL | pub async fn public_future(rc: Rc<[u8]>) {
   |                                         ^ future returned by `public_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> tests/ui/future_not_send.rs:17:20
   |
LL | pub async fn public_future(rc: Rc<[u8]>) {
   |                            -- has type `std::rc::Rc<[u8]>` which is not `Send`
...
LL |     async { true }.await;
   |                    ^^^^^ await occurs here, with `rc` maybe used later
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:24:63
   |
LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                                                               ^^^^ future returned by `private_future2` is not `Send`
   |
note: captured value is not `Send`
  --> tests/ui/future_not_send.rs:24:26
   |
LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                          ^^ has type `std::rc::Rc<[u8]>` which is not `Send`
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`
note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
  --> tests/ui/future_not_send.rs:24:40
   |
LL | async fn private_future2(rc: Rc<[u8]>, cell: &Cell<usize>) -> bool {
   |                                        ^^^^ has type `&std::cell::Cell<usize>` which is not `Send`, because `std::cell::Cell<usize>` is not `Sync`
   = note: `std::cell::Cell<usize>` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:30:42
   |
LL | pub async fn public_future2(rc: Rc<[u8]>) {}
   |                                          ^ future returned by `public_future2` is not `Send`
   |
note: captured value is not `Send`
  --> tests/ui/future_not_send.rs:30:29
   |
LL | pub async fn public_future2(rc: Rc<[u8]>) {}
   |                             ^^ has type `std::rc::Rc<[u8]>` which is not `Send`
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Send`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:42:39
   |
LL |     async fn private_future(&self) -> usize {
   |                                       ^^^^^ future returned by `private_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> tests/ui/future_not_send.rs:45:24
   |
LL |     async fn private_future(&self) -> usize {
   |                             ----- has type `&Dummy` which is not `Send`
...
LL |         async { true }.await;
   |                        ^^^^^ await occurs here, with `&self` maybe used later
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:49:38
   |
LL |     pub async fn public_future(&self) {
   |                                      ^ future returned by `public_future` is not `Send`
   |
note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
  --> tests/ui/future_not_send.rs:49:32
   |
LL |     pub async fn public_future(&self) {
   |                                ^^^^^ has type `&Dummy` which is not `Send`, because `Dummy` is not `Sync`
   = note: `std::rc::Rc<[u8]>` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:61:37
   |
LL | async fn generic_future<T>(t: T) -> T
   |                                     ^ future returned by `generic_future` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> tests/ui/future_not_send.rs:67:20
   |
LL |     let rt = &t;
   |         -- has type `&T` which is not `Send`
LL |     async { true }.await;
   |                    ^^^^^ await occurs here, with `rt` maybe used later
   = note: `T` doesn't implement `std::marker::Sync`

error: future cannot be sent between threads safely
##[error]  --> tests/ui/future_not_send.rs:83:51
   |
LL | async fn generic_future_always_unsend<T>(_: Rc<T>) {
   |                                                   ^ future returned by `generic_future_always_unsend` is not `Send`
   |
note: future is not `Send` as this value is used across an await
  --> tests/ui/future_not_send.rs:86:20
   |
LL | async fn generic_future_always_unsend<T>(_: Rc<T>) {
   |                                          - has type `std::rc::Rc<T>` which is not `Send`
...
LL |     async { true }.await;
   |                    ^^^^^ await occurs here, with `_` maybe used later
   = note: `std::rc::Rc<T>` doesn't implement `std::marker::Send`

error: aborting due to 8 previous errors

estebank added 3 commits November 4, 2025 18:02

Use return type Span on async fns instead of whole fn def Span

3025465

Add test for dyn Trait in async fn return type

4f8b125

Account for async fn with dyn Trait return type in impl Trait s…

7f8a587

…uggestion

rustbot assigned jackh726 Nov 4, 2025

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Nov 4, 2025

Add test for type Alias = dyn Trait in return type

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estebank force-pushed the issue-147894 branch from 588dedd to 8eb24d0 Compare November 4, 2025 19:44

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estebank force-pushed the issue-147894 branch from 8eb24d0 to 44623a5 Compare November 4, 2025 22:13

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Correctly provide suggestions when encountering `async fn` with a `dyn Trait` return type #148491

Correctly provide suggestions when encountering `async fn` with a `dyn Trait` return type #148491

estebank commented Nov 4, 2025 •

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Correctly provide suggestions when encountering async fn with a dyn Trait return type #148491

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Correctly provide suggestions when encountering `async fn` with a `dyn Trait` return type #148491

Correctly provide suggestions when encountering `async fn` with a `dyn Trait` return type #148491

estebank commented Nov 4, 2025 •

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