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Github futures-macro: improve diagnostics on type mismatch by taiki-e · Pull Req...
source link: https://github.com/rust-lang/futures-rs/pull/2433
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Port of my patch (tokio-rs/tokio#3766) in tokio.
Code:
#[futures_test::test]
async fn f() {
Ok(())
}Before:
error[E0308]: mismatched types
--> futures/tests/test_macro.rs:1:1
|
1 | #[futures_test::test]
| ^^^^^^^^^^^^^^^^^^^^^ expected `()`, found enum `Result`
|
= note: expected unit type `()`
found enum `Result<(), _>`
= note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)
After:
error[E0308]: mismatched types
--> futures/tests/test_macro.rs:3:5
|
3 | Ok(())
| ^^^^^^ expected `()`, found enum `Result`
|
= note: expected unit type `()`
found enum `Result<(), _>`
help: consider using a semicolon here
|
3 | Ok(());
| ^
help: try adding a return type
|
2 | async fn f() -> Result<(), _> {
| ^^^^^^^^^^^^^^^^
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