error[E0369]: cannot add `&str` to `&str` --> $DIR/issue-39018.rs:2:22 | LL | let x = "Hello " + "World!"; | -------- ^ -------- &str | | | | | `+` cannot be used to concatenate two `&str` strings | &str | = note: string concatenation requires an owned `String` on the left help: create an owned `String` from a string reference | LL | let x = "Hello ".to_owned() + "World!"; | +++++++++++ error[E0369]: cannot add `World` to `World` --> $DIR/issue-39018.rs:8:26 | LL | let y = World::Hello + World::Goodbye; | ------------ ^ -------------- World | | | World | note: an implementation of `Add<_>` might be missing for `World` --> $DIR/issue-39018.rs:15:1 | LL | enum World { | ^^^^^^^^^^ must implement `Add<_>` note: the following trait must be implemented --> $SRC_DIR/core/src/ops/arith.rs:LL:COL | LL | pub trait Add { | ^^^^^^^^^^^^^^^^^^^^^^^^^ error[E0369]: cannot add `String` to `&str` --> $DIR/issue-39018.rs:11:22 | LL | let x = "Hello " + "World!".to_owned(); | -------- ^ ------------------- String | | | | | `+` cannot be used to concatenate a `&str` with a `String` | &str | help: create an owned `String` on the left and add a borrow on the right | LL | let x = "Hello ".to_owned() + &"World!".to_owned(); | +++++++++++ + error[E0369]: cannot add `&String` to `&String` --> $DIR/issue-39018.rs:26:16 | LL | let _ = &a + &b; | -- ^ -- &String | | | | | `+` cannot be used to concatenate two `&str` strings | &String | = note: string concatenation requires an owned `String` on the left help: remove the borrow to obtain an owned `String` | LL - let _ = &a + &b; LL + let _ = a + &b; | error[E0369]: cannot add `String` to `&String` --> $DIR/issue-39018.rs:27:16 | LL | let _ = &a + b; | -- ^ - String | | | | | `+` cannot be used to concatenate a `&str` with a `String` | &String | help: remove the borrow on the left and add one on the right | LL - let _ = &a + b; LL + let _ = a + &b; | error[E0308]: mismatched types --> $DIR/issue-39018.rs:29:17 | LL | let _ = a + b; | ^ | | | expected `&str`, found struct `String` | help: consider borrowing here: `&b` error[E0369]: cannot add `String` to `&String` --> $DIR/issue-39018.rs:30:15 | LL | let _ = e + b; | - ^ - String | | | | | `+` cannot be used to concatenate a `&str` with a `String` | &String | help: create an owned `String` on the left and add a borrow on the right | LL | let _ = e.to_owned() + &b; | +++++++++++ + error[E0369]: cannot add `&String` to `&String` --> $DIR/issue-39018.rs:31:15 | LL | let _ = e + &b; | - ^ -- &String | | | | | `+` cannot be used to concatenate two `&str` strings | &String | = note: string concatenation requires an owned `String` on the left help: create an owned `String` from a string reference | LL | let _ = e.to_owned() + &b; | +++++++++++ error[E0369]: cannot add `&str` to `&String` --> $DIR/issue-39018.rs:32:15 | LL | let _ = e + d; | - ^ - &str | | | | | `+` cannot be used to concatenate two `&str` strings | &String | = note: string concatenation requires an owned `String` on the left help: create an owned `String` from a string reference | LL | let _ = e.to_owned() + d; | +++++++++++ error[E0369]: cannot add `&&str` to `&String` --> $DIR/issue-39018.rs:33:15 | LL | let _ = e + &d; | - ^ -- &&str | | | | | `+` cannot be used to concatenate two `&str` strings | &String | = note: string concatenation requires an owned `String` on the left help: create an owned `String` from a string reference | LL | let _ = e.to_owned() + &d; | +++++++++++ error[E0369]: cannot add `&&str` to `&&str` --> $DIR/issue-39018.rs:34:16 | LL | let _ = &c + &d; | -- ^ -- &&str | | | &&str error[E0369]: cannot add `&str` to `&&str` --> $DIR/issue-39018.rs:35:16 | LL | let _ = &c + d; | -- ^ - &str | | | &&str error[E0369]: cannot add `&&str` to `&str` --> $DIR/issue-39018.rs:36:15 | LL | let _ = c + &d; | - ^ -- &&str | | | | | `+` cannot be used to concatenate two `&str` strings | &str | = note: string concatenation requires an owned `String` on the left help: create an owned `String` from a string reference | LL | let _ = c.to_owned() + &d; | +++++++++++ error[E0369]: cannot add `&str` to `&str` --> $DIR/issue-39018.rs:37:15 | LL | let _ = c + d; | - ^ - &str | | | | | `+` cannot be used to concatenate two `&str` strings | &str | = note: string concatenation requires an owned `String` on the left help: create an owned `String` from a string reference | LL | let _ = c.to_owned() + d; | +++++++++++ error: aborting due to 14 previous errors Some errors have detailed explanations: E0308, E0369. For more information about an error, try `rustc --explain E0308`.