mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-27 07:00:55 +00:00
2891d8f72f
This lets us detect more complex situations: `async { x.await }` is
simplified into `x` if:
- `x` is an expression without side-effect
- or `x` is an async block itself
In both cases, no part of the `async` expression can be part of a macro
expansion.
74 lines
2.7 KiB
Text
74 lines
2.7 KiB
Text
error: this async expression only awaits a single future
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--> $DIR/redundant_async_block.rs:15:13
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LL | let x = async { f.await };
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| ^^^^^^^^^^^^^^^^^ help: you can reduce it to: `f`
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= note: `-D clippy::redundant-async-block` implied by `-D warnings`
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error: this async expression only awaits a single future
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--> $DIR/redundant_async_block.rs:22:16
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LL | let fut2 = async { fut1.await };
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| ^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `fut1`
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error: this async expression only awaits a single future
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--> $DIR/redundant_async_block.rs:26:16
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LL | let fut2 = async move { fut1.await };
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| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `fut1`
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error: this async expression only awaits a single future
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--> $DIR/redundant_async_block.rs:29:15
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LL | let fut = async { async { 42 }.await };
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `async { 42 }`
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error: this async expression only awaits a single future
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--> $DIR/redundant_async_block.rs:45:5
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LL | async move { fut.await }
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| ^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `fut`
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error: this async expression only awaits a single future
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--> $DIR/redundant_async_block.rs:58:5
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LL | async move { fut.await }
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| ^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `fut`
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error: this async expression only awaits a single future
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--> $DIR/redundant_async_block.rs:63:5
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LL | async { f.await }
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| ^^^^^^^^^^^^^^^^^ help: you can reduce it to: `f`
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error: this async expression only awaits a single future
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--> $DIR/redundant_async_block.rs:86:5
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LL | async { async { f().await + 1 }.await }
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `async { f().await + 1 }`
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error: this async expression only awaits a single future
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--> $DIR/redundant_async_block.rs:149:13
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LL | async { async { 42 }.await }
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `async { 42 }`
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...
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LL | mac!()
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| ------ in this macro invocation
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= note: this error originates in the macro `mac` (in Nightly builds, run with -Z macro-backtrace for more info)
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error: this async expression only awaits a single future
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--> $DIR/redundant_async_block.rs:169:13
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LL | async { async { $e }.await }
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can reduce it to: `async { $e }`
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...
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LL | mac!(42)
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| -------- in this macro invocation
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= note: this error originates in the macro `mac` (in Nightly builds, run with -Z macro-backtrace for more info)
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error: aborting due to 10 previous errors
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