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