69 lines
2.3 KiB
Rust
69 lines
2.3 KiB
Rust
#![feature(coroutines, negative_impls, rustc_attrs, stmt_expr_attributes)]
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macro_rules! type_combinations {
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(
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$( $name:ident => { $( $tt:tt )* } );* $(;)?
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) => { $(
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mod $name {
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$( $tt )*
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impl !Sync for Client {}
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impl !Send for Client {}
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}
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// Struct update syntax. This fails because the Client used in the update is considered
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// dropped *after* the yield.
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{
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let g = #[coroutine] move || match drop($name::Client { ..$name::Client::default() }) {
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//~^ `significant_drop::Client` which is not `Send`
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//~| `insignificant_dtor::Client` which is not `Send`
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//~| `derived_drop::Client` which is not `Send`
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_ => yield,
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};
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assert_send(g);
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//~^ ERROR cannot be sent between threads
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//~| ERROR cannot be sent between threads
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//~| ERROR cannot be sent between threads
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}
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// Simple owned value. This works because the Client is considered moved into `drop`,
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// even though the temporary expression doesn't end until after the yield.
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{
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let g = #[coroutine] move || match drop($name::Client::default()) {
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_ => yield,
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};
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assert_send(g);
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}
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)* }
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}
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fn assert_send<T: Send>(_thing: T) {}
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fn main() {
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type_combinations!(
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// OK
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copy => { #[derive(Copy, Clone, Default)] pub struct Client; };
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// NOT OK: MIR borrowck thinks that this is used after the yield, even though
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// this has no `Drop` impl and only the drops of the fields are observable.
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// FIXME: this should compile.
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derived_drop => { #[derive(Default)] pub struct Client { pub nickname: String } };
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// NOT OK
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significant_drop => {
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#[derive(Default)]
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pub struct Client;
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impl Drop for Client {
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fn drop(&mut self) {}
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}
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};
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// NOT OK (we need to agree with MIR borrowck)
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insignificant_dtor => {
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#[derive(Default)]
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#[rustc_insignificant_dtor]
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pub struct Client;
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impl Drop for Client {
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fn drop(&mut self) {}
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}
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};
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);
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}
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