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error[E0369]: cannot add `&str` to `&String`
--> $DIR/str-concat-on-double-ref.rs:4:15
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LL | let c = a + b;
| - ^ - &str
| | |
| | `+` cannot be used to concatenate two `&str` strings
| &String
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= note: string concatenation requires an owned `String` on the left
help: create an owned `String` from a string reference
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LL | let c = a.to_owned() + b;
| +++++++++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0369`.
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