error[E0369]: cannot add `{integer}` to `&str`
  --> $DIR/issue-79040.rs:2:25
   |
LL |     const FOO = "hello" + 1;
   |                 ------- ^ - {integer}
   |                 |
   |                 &str

error: missing type for `const` item
  --> $DIR/issue-79040.rs:2:11
   |
LL |     const FOO = "hello" + 1;
   |           ^^^ help: provide a type for the item: `FOO: <type>`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0369`.