45efb8e6a6
We currently provide only a `help` message, this PR introduces the last
two structured suggestions instead:
```
error[E0308]: mismatched types
--> $DIR/issue-98982.rs:2:5
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LL | fn foo() -> i32 {
| --- expected `i32` because of return type
LL | / for i in 0..0 {
LL | | return i;
LL | | }
| |_____^ expected `i32`, found `()`
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note: the function expects a value to always be returned, but loops might run zero times
--> $DIR/issue-98982.rs:2:5
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LL | for i in 0..0 {
| ^^^^^^^^^^^^^ this might have zero elements to iterate on
LL | return i;
| -------- if the loop doesn't execute, this value would never get returned
help: return a value for the case when the loop has zero elements to iterate on
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LL ~ }
LL ~ /* `i32` value */
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help: otherwise consider changing the return type to account for that possibility
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LL ~ fn foo() -> Option<i32> {
LL | for i in 0..0 {
LL ~ return Some(i);
LL ~ }
LL ~ None
|
```
Fix #98982.
46 lines
1.5 KiB
Plaintext
46 lines
1.5 KiB
Plaintext
error[E0308]: mismatched types
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--> $DIR/break-while-condition.rs:9:20
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LL | let _: ! = {
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| ____________________^
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LL | | 'a: while break 'a {};
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LL | | };
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| |_________^ expected `!`, found `()`
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= note: expected type `!`
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found unit type `()`
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error[E0308]: mismatched types
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--> $DIR/break-while-condition.rs:16:13
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LL | / while false {
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LL | | break
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LL | | }
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| |_____________^ expected `!`, found `()`
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= note: expected type `!`
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found unit type `()`
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error[E0308]: mismatched types
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--> $DIR/break-while-condition.rs:24:13
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LL | / while false {
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LL | | return
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LL | | }
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| |_____________^ expected `!`, found `()`
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= note: expected type `!`
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found unit type `()`
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note: the function expects a value to always be returned, but loops might run zero times
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--> $DIR/break-while-condition.rs:24:13
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LL | while false {
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| ^^^^^^^^^^^ this might have zero elements to iterate on
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LL | return
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| ------ if the loop doesn't execute, this value would never get returned
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= help: return a value for the case when the loop has zero elements to iterate on, otherwise consider changing the return type to account for that possibility
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error: aborting due to 3 previous errors
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For more information about this error, try `rustc --explain E0308`.
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