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31 lines
1.3 KiB
Rust
31 lines
1.3 KiB
Rust
// For `Send` coroutines, suggest a `T: Sync` requirement for `&T` upvars,
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// and suggest a `T: Send` requirement for `&mut T` upvars.
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#![feature(coroutines, stmt_expr_attributes)]
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fn assert_send<T: Send>(_: T) {}
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//~^ NOTE required by a bound in `assert_send`
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//~| NOTE required by this bound in `assert_send`
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//~| NOTE required by a bound in `assert_send`
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//~| NOTE required by this bound in `assert_send`
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fn main() {
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let x: &*mut () = &std::ptr::null_mut();
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let y: &mut *mut () = &mut std::ptr::null_mut();
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assert_send(#[coroutine] move || {
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//~^ ERROR coroutine cannot be sent between threads safely
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//~| NOTE coroutine is not `Send`
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yield;
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let _x = x;
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});
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//~^^ NOTE captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
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//~| NOTE has type `&*mut ()` which is not `Send`, because `*mut ()` is not `Sync`
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assert_send(#[coroutine] move || {
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//~^ ERROR coroutine cannot be sent between threads safely
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//~| NOTE coroutine is not `Send`
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yield;
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let _y = y;
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});
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//~^^ NOTE captured value is not `Send` because `&mut` references cannot be sent unless their referent is `Send`
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//~| NOTE has type `&mut *mut ()` which is not `Send`, because `*mut ()` is not `Send`
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}
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