04fa9b1b3f
This commit improves obligation errors for async/await:
```
note: future does not implement `std::marker::Send` because this value is used across an
await
--> $DIR/issue-64130-non-send-future-diags.rs:15:5
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LL | let g = x.lock().unwrap();
| - has type `std::sync::MutexGuard<'_, u32>`
LL | baz().await;
| ^^^^^^^^^^^ await occurs here, with `g` maybe used later
LL | }
| - `g` is later dropped here
```
Signed-off-by: David Wood <david@davidtw.co>
80 lines
7.2 KiB
Plaintext
80 lines
7.2 KiB
Plaintext
error[E0277]: `std::rc::Rc<()>` cannot be sent between threads safely
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--> $DIR/async-fn-nonsend.rs:50:5
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LL | fn assert_send(_: impl Send) {}
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| ----------- ---- required by this bound in `assert_send`
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...
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LL | assert_send(local_dropped_before_await());
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| ^^^^^^^^^^^ `std::rc::Rc<()>` cannot be sent between threads safely
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= help: within `impl std::future::Future`, the trait `std::marker::Send` is not implemented for `std::rc::Rc<()>`
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= note: required because it appears within the type `impl std::fmt::Debug`
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= note: required because it appears within the type `{impl std::fmt::Debug, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}`
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= note: required because it appears within the type `[static generator@$DIR/async-fn-nonsend.rs:21:39: 26:2 {impl std::fmt::Debug, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}]`
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= note: required because it appears within the type `std::future::GenFuture<[static generator@$DIR/async-fn-nonsend.rs:21:39: 26:2 {impl std::fmt::Debug, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}]>`
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= note: required because it appears within the type `impl std::future::Future`
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= note: required because it appears within the type `impl std::future::Future`
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error[E0277]: `std::rc::Rc<()>` cannot be sent between threads safely
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--> $DIR/async-fn-nonsend.rs:52:5
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LL | fn assert_send(_: impl Send) {}
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| ----------- ---- required by this bound in `assert_send`
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...
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LL | assert_send(non_send_temporary_in_match());
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| ^^^^^^^^^^^ `std::rc::Rc<()>` cannot be sent between threads safely
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= help: within `impl std::future::Future`, the trait `std::marker::Send` is not implemented for `std::rc::Rc<()>`
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= note: required because it appears within the type `impl std::fmt::Debug`
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= note: required because it appears within the type `{fn(impl std::fmt::Debug) -> std::option::Option<impl std::fmt::Debug> {std::option::Option::<impl std::fmt::Debug>::Some}, fn() -> impl std::fmt::Debug {non_send}, impl std::fmt::Debug, std::option::Option<impl std::fmt::Debug>, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}`
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= note: required because it appears within the type `[static generator@$DIR/async-fn-nonsend.rs:28:40: 37:2 {fn(impl std::fmt::Debug) -> std::option::Option<impl std::fmt::Debug> {std::option::Option::<impl std::fmt::Debug>::Some}, fn() -> impl std::fmt::Debug {non_send}, impl std::fmt::Debug, std::option::Option<impl std::fmt::Debug>, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}]`
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= note: required because it appears within the type `std::future::GenFuture<[static generator@$DIR/async-fn-nonsend.rs:28:40: 37:2 {fn(impl std::fmt::Debug) -> std::option::Option<impl std::fmt::Debug> {std::option::Option::<impl std::fmt::Debug>::Some}, fn() -> impl std::fmt::Debug {non_send}, impl std::fmt::Debug, std::option::Option<impl std::fmt::Debug>, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}]>`
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= note: required because it appears within the type `impl std::future::Future`
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= note: required because it appears within the type `impl std::future::Future`
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error[E0277]: `dyn std::fmt::Write` cannot be sent between threads safely
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--> $DIR/async-fn-nonsend.rs:54:5
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LL | fn assert_send(_: impl Send) {}
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| ----------- ---- required by this bound in `assert_send`
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...
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LL | assert_send(non_sync_with_method_call());
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| ^^^^^^^^^^^ `dyn std::fmt::Write` cannot be sent between threads safely
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= help: the trait `std::marker::Send` is not implemented for `dyn std::fmt::Write`
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= note: required because of the requirements on the impl of `std::marker::Send` for `&mut dyn std::fmt::Write`
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= note: required because it appears within the type `std::fmt::Formatter<'_>`
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= note: required because of the requirements on the impl of `std::marker::Send` for `&mut std::fmt::Formatter<'_>`
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= note: required because it appears within the type `for<'r, 's> {&'r mut std::fmt::Formatter<'s>, bool, bool, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}`
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= note: required because it appears within the type `[static generator@$DIR/async-fn-nonsend.rs:39:38: 45:2 for<'r, 's> {&'r mut std::fmt::Formatter<'s>, bool, bool, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}]`
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= note: required because it appears within the type `std::future::GenFuture<[static generator@$DIR/async-fn-nonsend.rs:39:38: 45:2 for<'r, 's> {&'r mut std::fmt::Formatter<'s>, bool, bool, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}]>`
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= note: required because it appears within the type `impl std::future::Future`
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= note: required because it appears within the type `impl std::future::Future`
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error[E0277]: `*mut (dyn std::ops::Fn() + 'static)` cannot be shared between threads safely
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--> $DIR/async-fn-nonsend.rs:54:5
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LL | fn assert_send(_: impl Send) {}
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| ----------- ---- required by this bound in `assert_send`
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...
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LL | assert_send(non_sync_with_method_call());
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| ^^^^^^^^^^^ `*mut (dyn std::ops::Fn() + 'static)` cannot be shared between threads safely
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= help: within `std::fmt::ArgumentV1<'_>`, the trait `std::marker::Sync` is not implemented for `*mut (dyn std::ops::Fn() + 'static)`
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= note: required because it appears within the type `std::marker::PhantomData<*mut (dyn std::ops::Fn() + 'static)>`
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= note: required because it appears within the type `core::fmt::Void`
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= note: required because it appears within the type `&core::fmt::Void`
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= note: required because it appears within the type `std::fmt::ArgumentV1<'_>`
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= note: required because of the requirements on the impl of `std::marker::Send` for `std::slice::Iter<'_, std::fmt::ArgumentV1<'_>>`
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= note: required because it appears within the type `std::fmt::Formatter<'_>`
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= note: required because of the requirements on the impl of `std::marker::Send` for `&mut std::fmt::Formatter<'_>`
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= note: required because it appears within the type `for<'r, 's> {&'r mut std::fmt::Formatter<'s>, bool, bool, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}`
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= note: required because it appears within the type `[static generator@$DIR/async-fn-nonsend.rs:39:38: 45:2 for<'r, 's> {&'r mut std::fmt::Formatter<'s>, bool, bool, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}]`
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= note: required because it appears within the type `std::future::GenFuture<[static generator@$DIR/async-fn-nonsend.rs:39:38: 45:2 for<'r, 's> {&'r mut std::fmt::Formatter<'s>, bool, bool, fn() -> impl std::future::Future {fut}, impl std::future::Future, impl std::future::Future, ()}]>`
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= note: required because it appears within the type `impl std::future::Future`
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= note: required because it appears within the type `impl std::future::Future`
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error: aborting due to 4 previous errors
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For more information about this error, try `rustc --explain E0277`.
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