If you have unused variables, the code will not compile. For more information about unused variables and imports, refer to Unused imports and variables at go.dev.

func main() {
 a := 422
}

Code in the example will not compile. Therefore, it is highlighted as an error. You can apply two quick-fixes for such cases: Delete variable and Rename to _. The first quick-fix deletes the variable, the second one will convert the variable to a blank identifier.

After the Rename to _ quick-fix is applied:

func main() {
 _ := 422
}