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8221f9c837
On functions with a default return type that influences the coerced type
of `match` arms, check if the failing arm is actually of type `!`. If
so, suggest changing the return type so the coercion against the prior
arms is successful.
```
error[E0308]: `match` arms have incompatible types
--> $DIR/match-tail-expr-never-type-error.rs:9:13
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LL | fn bar(a: bool) {
| - help: try adding a return type: `-> i32`
LL | / match a {
LL | | true => 1,
| | - this is found to be of type `{integer}`
LL | | false => {
LL | | never()
| | ^^^^^^^
| | |
| | expected integer, found `()`
| | this expression is of type `!`, but it get's coerced to `()` due to its surrounding expression
LL | | }
LL | | }
| |_____- `match` arms have incompatible types
```
Fix #24157.
17 lines
233 B
Rust
17 lines
233 B
Rust
fn never() -> ! {
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loop {}
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}
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fn bar(a: bool) {
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match a {
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true => 1,
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false => {
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never() //~ ERROR `match` arms have incompatible types
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}
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}
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}
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fn main() {
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bar(true);
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bar(false);
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}
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