66 lines
1.5 KiB
Rust
66 lines
1.5 KiB
Rust
// Test that `async { .. }` blocks:
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// 1. do not allow `break` expressions.
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// 2. get targeted by `return` and not the parent function.
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// 3. get targeted by `?` and not the parent function.
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//
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//@ edition:2018
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fn main() {}
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use core::future::Future;
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fn return_targets_async_block_not_fn() -> u8 {
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//~^ ERROR mismatched types
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let block = async {
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return 0u8;
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};
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let _: &dyn Future<Output = ()> = █
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//~^ ERROR to be a future that resolves to `()`, but it resolves to `u8`
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}
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async fn return_targets_async_block_not_async_fn() -> u8 {
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//~^ ERROR mismatched types [E0308]
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let block = async {
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return 0u8;
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};
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let _: &dyn Future<Output = ()> = █
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//~^ ERROR to be a future that resolves to `()`, but it resolves to `u8`
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}
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fn no_break_in_async_block() {
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async {
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break 0u8; //~ ERROR `break` inside of an `async` block
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};
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}
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fn no_break_in_async_block_even_with_outer_loop() {
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loop {
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async {
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break 0u8; //~ ERROR `break` inside of an `async` block
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};
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}
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}
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struct MyErr;
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fn err() -> Result<u8, MyErr> {
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Err(MyErr)
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}
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fn rethrow_targets_async_block_not_fn() -> Result<u8, MyErr> {
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//~^ ERROR mismatched types
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let block = async {
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err()?;
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Ok(())
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};
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let _: &dyn Future<Output = Result<(), MyErr>> = █
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}
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fn rethrow_targets_async_block_not_async_fn() -> Result<u8, MyErr> {
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//~^ ERROR mismatched types
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let block = async {
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err()?;
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Ok(())
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};
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let _: &dyn Future<Output = Result<(), MyErr>> = █
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}
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