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error[E0369]: binary operation `+` cannot be applied to type `&'static str`
--> $DIR/issue-39018.rs:12:13
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12 | let x = "Hello " + "World!";
| ^^^^^^^^
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= note: `+` can't be used to concatenate two `&str` strings
help: to_owned() can be used to create an owned `String` from a string reference. String concatenation appends the string on the right to the string on the left and may require reallocation. This requires ownership of the string on the left.
| let x = "Hello ".to_owned() + "World!";
error[E0369]: binary operation `+` cannot be applied to type `World`
--> $DIR/issue-39018.rs:17:13
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17 | let y = World::Hello + World::Goodbye;
| ^^^^^^^^^^^^
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= note: an implementation of `std::ops::Add` might be missing for `World`
error: aborting due to 2 previous errors
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