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error[E0308]: `if` and `else` have incompatible types
--> $DIR/suggest-boxed-trait-objects-instead-of-impl-trait.rs:17:9
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LL | / if true {
LL | | S
| | - expected because of this
LL | | } else {
LL | | Y
| | ^ expected struct `S`, found struct `Y`
LL | | }
| |_____- `if` and `else` have incompatible types
|
help: you could change the return type to be a boxed trait object
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LL | fn foo() -> Box<dyn Trait> {
| ~~~~~~~ +
help: if you change the return type to expect trait objects, box the returned expressions
|
LL ~ Box::new(S)
LL | } else {
LL ~ Box::new(Y)
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error[E0308]: `match` arms have incompatible types
--> $DIR/suggest-boxed-trait-objects-instead-of-impl-trait.rs:24:18
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LL | / match true {
LL | | true => S,
| | - this is found to be of type `S`
LL | | false => Y,
| | ^ expected struct `S`, found struct `Y`
LL | | }
| |_____- `match` arms have incompatible types
|
help: you could change the return type to be a boxed trait object
|
LL | fn bar() -> Box<dyn Trait> {
| ~~~~~~~ +
help: if you change the return type to expect trait objects, box the returned expressions
|
LL ~ true => Box::new(S),
LL ~ false => Box::new(Y),
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error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0308`.
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