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macros: fix type resolution error in #[tokio::main] (#4176)

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This commit is contained in:
Taiki Endo
2021-11-16 12:22:24 -08:00
committed by Eliza Weisman
parent c9228bf751
commit 2bf613206a
4 changed files with 45 additions and 12 deletions
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tests-build/tests/fail/macros_type_mismatch.rs
+8
View File
@@ -12,6 +12,14 @@ async fn missing_return_type() {
#[tokio::main]
async fn extra_semicolon() -> Result<(), ()> {
/* TODO(taiki-e): help message still wrong
help: try using a variant of the expected enum
|
23 | Ok(Ok(());)
|
23 | Err(Ok(());)
|
*/
Ok(());
}
tests-build/tests/fail/macros_type_mismatch.stderr
+11 -4
View File
@@ -27,12 +27,19 @@ error[E0308]: mismatched types
found enum `Result<(), _>`
error[E0308]: mismatched types
--> $DIR/macros_type_mismatch.rs:14:31
--> $DIR/macros_type_mismatch.rs:23:5
|
14 | async fn extra_semicolon() -> Result<(), ()> {
| --------------- ^^^^^^^^^^^^^^ expected enum `Result`, found `()`
| |
| implicitly returns `()` as its body has no tail or `return` expression
| -------------- expected `Result<(), ()>` because of return type
...
23 | Ok(());
| ^^^^^^^ expected enum `Result`, found `()`
|
= note: expected enum `Result<(), ()>`
found unit type `()`
help: try using a variant of the expected enum
|
23 | Ok(Ok(());)
|
23 | Err(Ok(());)
|