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macros: improve error message for return type mismatch in #[tokio::main] (#7856)

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This commit is contained in:
Chinmoy Das
2026-01-25 01:09:05 +09:00
committed by GitHub
parent 63abec0525
commit 8f6d0864c3
4 changed files with 127 additions and 7 deletions
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tests-build/tests/fail/macros_type_mismatch.stderr
+64
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@@ -1,3 +1,14 @@
error[E0271]: expected `{async block@$DIR/tests/fail/macros_type_mismatch.rs:3:1: 3:15}` to be a future that resolves to `()`, but it resolves to `Result<(), _>`
--> tests/fail/macros_type_mismatch.rs:3:1
|
3 | #[tokio::main]
| ^^^^^^^^^^^^^^ expected `()`, found `Result<(), _>`
|
= note: expected unit type `()`
found enum `Result<(), _>`
= note: required for the cast from `&{async block@$DIR/tests/fail/macros_type_mismatch.rs:3:1: 3:15}` to `&dyn Future<Output = ()>`
= note: this error originates in the attribute macro `tokio::main` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0308]: mismatched types
--> tests/fail/macros_type_mismatch.rs:5:5
|
@@ -15,6 +26,17 @@ help: consider using `Result::expect` to unwrap the `Result<(), _>` value, panic
5 | Ok(()).expect("REASON")
| +++++++++++++++++
error[E0271]: expected `{async block@$DIR/tests/fail/macros_type_mismatch.rs:8:1: 8:15}` to be a future that resolves to `()`, but it resolves to `Result<(), _>`
--> tests/fail/macros_type_mismatch.rs:8:1
|
8 | #[tokio::main]
| ^^^^^^^^^^^^^^ expected `()`, found `Result<(), _>`
|
= note: expected unit type `()`
found enum `Result<(), _>`
= note: required for the cast from `&{async block@$DIR/tests/fail/macros_type_mismatch.rs:8:1: 8:15}` to `&dyn Future<Output = ()>`
= note: this error originates in the attribute macro `tokio::main` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0308]: mismatched types
--> tests/fail/macros_type_mismatch.rs:10:5
|
@@ -32,6 +54,17 @@ help: consider using `Result::expect` to unwrap the `Result<(), _>` value, panic
10 | return Ok(());.expect("REASON")
| +++++++++++++++++
error[E0271]: expected `{async block@$DIR/tests/fail/macros_type_mismatch.rs:13:1: 13:15}` to be a future that resolves to `Result<(), ()>`, but it resolves to `()`
--> tests/fail/macros_type_mismatch.rs:13:1
|
13 | #[tokio::main]
| ^^^^^^^^^^^^^^ expected `Result<(), ()>`, found `()`
|
= note: expected enum `Result<(), ()>`
found unit type `()`
= note: required for the cast from `&{async block@$DIR/tests/fail/macros_type_mismatch.rs:13:1: 13:15}` to `&dyn Future<Output = Result<(), ()>>`
= note: this error originates in the attribute macro `tokio::main` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0308]: mismatched types
--> tests/fail/macros_type_mismatch.rs:23:5
|
@@ -58,6 +91,17 @@ error[E0277]: the `?` operator can only be used in an async block that returns `
40 | None?;
| ^ cannot use the `?` operator in an async block that returns `()`
error[E0271]: expected `{async block@$DIR/tests/fail/macros_type_mismatch.rs:38:1: 38:15}` to be a future that resolves to `Option<()>`, but it resolves to `()`
--> tests/fail/macros_type_mismatch.rs:38:1
|
38 | #[tokio::main]
| ^^^^^^^^^^^^^^ expected `Option<()>`, found `()`
|
= note: expected enum `Option<()>`
found unit type `()`
= note: required for the cast from `&{async block@$DIR/tests/fail/macros_type_mismatch.rs:38:1: 38:15}` to `&dyn Future<Output = Option<()>>`
= note: this error originates in the attribute macro `tokio::main` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0308]: mismatched types
--> tests/fail/macros_type_mismatch.rs:40:5
|
@@ -86,6 +130,17 @@ error[E0277]: the `?` operator can only be used in an async block that returns `
57 | Ok(())?;
| ^ cannot use the `?` operator in an async block that returns `()`
error[E0271]: expected `{async block@$DIR/tests/fail/macros_type_mismatch.rs:55:1: 55:15}` to be a future that resolves to `Result<(), ()>`, but it resolves to `()`
--> tests/fail/macros_type_mismatch.rs:55:1
|
55 | #[tokio::main]
| ^^^^^^^^^^^^^^ expected `Result<(), ()>`, found `()`
|
= note: expected enum `Result<(), ()>`
found unit type `()`
= note: required for the cast from `&{async block@$DIR/tests/fail/macros_type_mismatch.rs:55:1: 55:15}` to `&dyn Future<Output = Result<(), ()>>`
= note: this error originates in the attribute macro `tokio::main` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0308]: mismatched types
--> tests/fail/macros_type_mismatch.rs:57:5
|
@@ -102,6 +157,15 @@ help: try adding an expression at the end of the block
58 + Ok(())
|
error[E0271]: expected `{async block@$DIR/tests/fail/macros_type_mismatch.rs:63:1: 63:15}` to be a future that resolves to `()`, but it resolves to `{integer}`
--> tests/fail/macros_type_mismatch.rs:63:1
|
63 | #[tokio::main]
| ^^^^^^^^^^^^^^ expected `()`, found integer
|
= note: required for the cast from `&{async block@$DIR/tests/fail/macros_type_mismatch.rs:63:1: 63:15}` to `&dyn Future<Output = ()>`
= note: this error originates in the attribute macro `tokio::main` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0308]: mismatched types
--> tests/fail/macros_type_mismatch.rs:66:5
|