mirror of https://github.com/rust-lang/rust
125 lines
4.6 KiB
Plaintext
125 lines
4.6 KiB
Plaintext
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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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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| --- `*x` is borrowed here
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LL | *x += 1;
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| ^^^^^^^ `*x` is assigned to here but it was already borrowed
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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:18:9
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LL | let y = &*x;
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| --- `*x` is borrowed here
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LL | *x += 1;
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| ^^^^^^^ `*x` is assigned to here but it was already borrowed
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LL | y
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| - returning this value requires that `*x` is borrowed for `'1`
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LL | })()
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| - return type of async closure is &'1 i32
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error: lifetime may not live long enough
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--> $DIR/issue-74072-lifetime-name-annotations.rs:14:20
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LL | (async move || {
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| ______-------------_^
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| | | |
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| | | return type of async closure `{async closure body@$DIR/issue-74072-lifetime-name-annotations.rs:14:20: 20:6}` contains a lifetime `'2`
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| | lifetime `'1` represents this closure's body
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LL | |
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LL | |
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LL | | let y = &*x;
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LL | | *x += 1;
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LL | | y
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LL | | })()
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| |_____^ returning this value requires that `'1` must outlive `'2`
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= note: closure implements `FnMut`, so references to captured variables can't escape the closure
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/issue-74072-lifetime-name-annotations.rs:14:5
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LL | pub fn async_closure(x: &mut i32) -> impl Future<Output=&i32> {
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| - let's call the lifetime of this reference `'1`
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LL | // (async move || {
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LL | ||
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LL | ||
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LL | || let y = &*x;
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LL | || *x += 1;
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LL | || y
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LL | || })()
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| ||______^_- argument requires that borrow lasts for `'1`
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| |_______|
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| creates a temporary value which is freed while still in use
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LL | }
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| - temporary value is freed at the end of this statement
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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:28:9
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LL | let y = &*x;
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| --- `*x` is borrowed here
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LL | *x += 1;
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| ^^^^^^^ `*x` is assigned to here but it was already borrowed
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LL | y
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| - returning this value requires that `*x` is borrowed for `'1`
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LL | })()
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| - return type of async closure is &'1 i32
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error: lifetime may not live long enough
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--> $DIR/issue-74072-lifetime-name-annotations.rs:24:28
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LL | (async move || -> &i32 {
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| ______---------------------_^
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| | | |
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| | | return type of async closure `{async closure body@$DIR/issue-74072-lifetime-name-annotations.rs:24:28: 30:6}` contains a lifetime `'2`
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| | lifetime `'1` represents this closure's body
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LL | |
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LL | |
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LL | | let y = &*x;
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LL | | *x += 1;
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LL | | y
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LL | | })()
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| |_____^ returning this value requires that `'1` must outlive `'2`
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= note: closure implements `FnMut`, so references to captured variables can't escape the closure
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/issue-74072-lifetime-name-annotations.rs:24:5
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LL | pub fn async_closure_explicit_return_type(x: &mut i32) -> impl Future<Output=&i32> {
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| - let's call the lifetime of this reference `'1`
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LL | // (async move || -> &i32 {
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LL | ||
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LL | ||
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LL | || let y = &*x;
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LL | || *x += 1;
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LL | || y
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LL | || })()
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| ||______^_- argument requires that borrow lasts for `'1`
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| |_______|
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| creates a temporary value which is freed while still in use
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LL | }
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| - temporary value is freed at the end of this statement
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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:36:9
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LL | let y = &*x;
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| --- `*x` is borrowed here
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LL | *x += 1;
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| ^^^^^^^ `*x` is assigned to here but it was already borrowed
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LL | y
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| - returning this value requires that `*x` is borrowed for `'1`
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LL | }
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| - return type of async block is &'1 i32
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error: aborting due to 8 previous errors
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Some errors have detailed explanations: E0506, E0716.
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For more information about an error, try `rustc --explain E0506`.
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