diff --git a/src/libcore/future/future.rs b/src/libcore/future/future.rs index 00a171e6b5fb1..abf461338d80a 100644 --- a/src/libcore/future/future.rs +++ b/src/libcore/future/future.rs @@ -27,6 +27,7 @@ use crate::task::{Context, Poll}; #[must_use = "futures do nothing unless you `.await` or poll them"] #[stable(feature = "futures_api", since = "1.36.0")] #[lang = "future_trait"] +#[rustc_on_unimplemented(label = "`{Self}` is not a future", message = "`{Self}` is not a future")] pub trait Future { /// The type of value produced on completion. #[stable(feature = "futures_api", since = "1.36.0")] diff --git a/src/test/ui/async-await/async-error-span.rs b/src/test/ui/async-await/async-error-span.rs index cf10ebfeca939..86d459bf084b1 100644 --- a/src/test/ui/async-await/async-error-span.rs +++ b/src/test/ui/async-await/async-error-span.rs @@ -5,7 +5,7 @@ use std::future::Future; fn get_future() -> impl Future { -//~^ ERROR the trait bound `(): std::future::Future` is not satisfied +//~^ ERROR `()` is not a future panic!() } diff --git a/src/test/ui/async-await/async-error-span.stderr b/src/test/ui/async-await/async-error-span.stderr index 4054e739c483d..9523f040aa8cd 100644 --- a/src/test/ui/async-await/async-error-span.stderr +++ b/src/test/ui/async-await/async-error-span.stderr @@ -1,12 +1,13 @@ -error[E0277]: the trait bound `(): std::future::Future` is not satisfied +error[E0277]: `()` is not a future --> $DIR/async-error-span.rs:7:20 | LL | fn get_future() -> impl Future { - | ^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::future::Future` is not implemented for `()` + | ^^^^^^^^^^^^^^^^^^^^^^^^ `()` is not a future LL | LL | panic!() | -------- this returned value is of type `!` | + = help: the trait `std::future::Future` is not implemented for `()` = note: the return type of a function must have a statically known size error[E0698]: type inside `async fn` body must be known in this context diff --git a/src/test/ui/async-await/issue-70594.rs b/src/test/ui/async-await/issue-70594.rs index e78231a68512d..34d12db8806dc 100644 --- a/src/test/ui/async-await/issue-70594.rs +++ b/src/test/ui/async-await/issue-70594.rs @@ -6,7 +6,7 @@ async fn fun() { //~| error: `.await` is not allowed in a `const` //~| error: `loop` is not allowed in a `const` //~| error: `.await` is not allowed in a `const` - //~| error: the trait bound `(): std::future::Future` is not satisfied + //~| error: `()` is not a future } fn main() {} diff --git a/src/test/ui/async-await/issue-70594.stderr b/src/test/ui/async-await/issue-70594.stderr index 496ca506c60f2..1b7abe317222d 100644 --- a/src/test/ui/async-await/issue-70594.stderr +++ b/src/test/ui/async-await/issue-70594.stderr @@ -27,12 +27,13 @@ error[E0744]: `.await` is not allowed in a `const` LL | [1; ().await]; | ^^^^^^^^ -error[E0277]: the trait bound `(): std::future::Future` is not satisfied +error[E0277]: `()` is not a future --> $DIR/issue-70594.rs:4:9 | LL | [1; ().await]; - | ^^^^^^^^ the trait `std::future::Future` is not implemented for `()` + | ^^^^^^^^ `()` is not a future | + = help: the trait `std::future::Future` is not implemented for `()` = note: required by `std::future::Future::poll` error: aborting due to 5 previous errors diff --git a/src/test/ui/async-await/issues/issue-62009-1.stderr b/src/test/ui/async-await/issues/issue-62009-1.stderr index ec4e9e397a81e..e3ba74a03c898 100644 --- a/src/test/ui/async-await/issues/issue-62009-1.stderr +++ b/src/test/ui/async-await/issues/issue-62009-1.stderr @@ -27,12 +27,13 @@ LL | fn main() { LL | (|_| 2333).await; | ^^^^^^^^^^^^^^^^ only allowed inside `async` functions and blocks -error[E0277]: the trait bound `[closure@$DIR/issue-62009-1.rs:12:5: 12:15]: std::future::Future` is not satisfied +error[E0277]: `[closure@$DIR/issue-62009-1.rs:12:5: 12:15]` is not a future --> $DIR/issue-62009-1.rs:12:5 | LL | (|_| 2333).await; - | ^^^^^^^^^^^^^^^^ the trait `std::future::Future` is not implemented for `[closure@$DIR/issue-62009-1.rs:12:5: 12:15]` + | ^^^^^^^^^^^^^^^^ `[closure@$DIR/issue-62009-1.rs:12:5: 12:15]` is not a future | + = help: the trait `std::future::Future` is not implemented for `[closure@$DIR/issue-62009-1.rs:12:5: 12:15]` = note: required by `std::future::Future::poll` error: aborting due to 4 previous errors diff --git a/src/test/ui/issues-71798.rs b/src/test/ui/issues-71798.rs index 08b10463d3927..fecba721ac9fd 100644 --- a/src/test/ui/issues-71798.rs +++ b/src/test/ui/issues-71798.rs @@ -1,5 +1,5 @@ fn test_ref(x: &u32) -> impl std::future::Future + '_ { - *x //~^ ERROR the trait bound `u32: std::future::Future` is not satisfied + *x //~^ ERROR `u32` is not a future } fn main() { diff --git a/src/test/ui/issues-71798.stderr b/src/test/ui/issues-71798.stderr index 85da87914e768..b3b29a7264131 100644 --- a/src/test/ui/issues-71798.stderr +++ b/src/test/ui/issues-71798.stderr @@ -4,14 +4,15 @@ error[E0425]: cannot find value `u` in this scope LL | let _ = test_ref & u; | ^ not found in this scope -error[E0277]: the trait bound `u32: std::future::Future` is not satisfied +error[E0277]: `u32` is not a future --> $DIR/issues-71798.rs:1:25 | LL | fn test_ref(x: &u32) -> impl std::future::Future + '_ { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::future::Future` is not implemented for `u32` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `u32` is not a future LL | *x | -- this returned value is of type `u32` | + = help: the trait `std::future::Future` is not implemented for `u32` = note: the return type of a function must have a statically known size error: aborting due to 2 previous errors diff --git a/src/test/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr b/src/test/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr index 99ba4e2a646e5..11372494772d0 100644 --- a/src/test/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr +++ b/src/test/ui/suggestions/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.stderr @@ -1,4 +1,4 @@ -error[E0277]: the trait bound `fn() -> impl std::future::Future {foo}: std::future::Future` is not satisfied +error[E0277]: `fn() -> impl std::future::Future {foo}` is not a future --> $DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:10:9 | LL | async fn foo() {} @@ -8,14 +8,15 @@ LL | fn bar(f: impl Future) {} | ----------------- required by this bound in `bar` ... LL | bar(foo); - | ^^^ the trait `std::future::Future` is not implemented for `fn() -> impl std::future::Future {foo}` + | ^^^ `fn() -> impl std::future::Future {foo}` is not a future | + = help: the trait `std::future::Future` is not implemented for `fn() -> impl std::future::Future {foo}` help: use parentheses to call the function | LL | bar(foo()); | ^^ -error[E0277]: the trait bound `[closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:36]: std::future::Future` is not satisfied +error[E0277]: `[closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:36]` is not a future --> $DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:12:9 | LL | fn bar(f: impl Future) {} @@ -24,8 +25,9 @@ LL | fn bar(f: impl Future) {} LL | let async_closure = async || (); | -------- consider calling this closure LL | bar(async_closure); - | ^^^^^^^^^^^^^ the trait `std::future::Future` is not implemented for `[closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:36]` + | ^^^^^^^^^^^^^ `[closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:36]` is not a future | + = help: the trait `std::future::Future` is not implemented for `[closure@$DIR/async-fn-ctor-passed-as-arg-where-it-should-have-been-called.rs:11:25: 11:36]` help: use parentheses to call the closure | LL | bar(async_closure());