vlib/v/checker/tests/method_op_err.vv:11:1: error: operator methods should have exactly 1 argument
    9 | }
   10 | 
   11 | fn (u User) + () {
      | ~~~~~~~~~~~~~~~~
   12 | }
   13 |
vlib/v/checker/tests/method_op_err.vv:14:18: error: expected `User` not `Foo` - both operands must be the same type for operator overloading
   12 | }
   13 | 
   14 | fn (u User) - (f Foo) User {
      |                  ~~~
   15 |     return User{u.a - f.a, u.b-f.a}
   16 | }
vlib/v/checker/tests/method_op_err.vv:18:9: error: receiver cannot be `mut` for operator overloading
   16 | }
   17 | 
   18 | fn (mut u User) * (u1 User) User {
      |         ~~~~~~
   19 |     return User{}
   20 | }
vlib/v/checker/tests/method_op_err.vv:22:1: error: argument cannot be `mut` for operator overloading
   20 | }
   21 | 
   22 | fn (u User) / (mut u1 User) User {
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   23 |     return User{}
   24 | }
vlib/v/checker/tests/method_op_err.vv:32:13: error: infix expr: cannot use `Foo` (right expression) as `User`
   30 | fn main() {
   31 |     println(User{3, 4})
   32 |     println(User{3, 4} - Foo{3, 3})
      |             ~~~~~~~~~~~~~~~~~~~~~~
   33 |     println(User{3, 2} < User{2, 4})
   34 |     println(User{3, 4} < Foo{3, 4})
vlib/v/checker/tests/method_op_err.vv:33:13: error: undefined operation `User` < `User`
   31 |     println(User{3, 4})
   32 |     println(User{3, 4} - Foo{3, 3})
   33 |     println(User{3, 2} < User{2, 4})
      |             ~~~~~~~~~~~~~~~~~~~~~~~
   34 |     println(User{3, 4} < Foo{3, 4})
   35 |     mut u := User{3, 4}
vlib/v/checker/tests/method_op_err.vv:34:13: error: mismatched types `User` and `Foo`
   32 |     println(User{3, 4} - Foo{3, 3})
   33 |     println(User{3, 2} < User{2, 4})
   34 |     println(User{3, 4} < Foo{3, 4})
      |             ~~~~~~~~~~~~~~~~~~~~~~
   35 |     mut u := User{3, 4}
   36 |    _ = u
vlib/v/checker/tests/method_op_err.vv:37:10: error: cannot assign to `u`: expected `User`, not `int literal`
   35 |     mut u := User{3, 4}
   36 |    _ = u
   37 |     u += 12
      |          ~~
   38 |     u %= User{1, 3}
   39 |     u += User{2, 3}
vlib/v/checker/tests/method_op_err.vv:38:5: error: operator %= not defined on left operand type `User`
   36 |    _ = u
   37 |     u += 12
   38 |     u %= User{1, 3}
      |     ^
   39 |     u += User{2, 3}
   40 | }
vlib/v/checker/tests/method_op_err.vv:39:7: error: operator `+` must return `User` to be used as an assignment operator
   37 |     u += 12
   38 |     u %= User{1, 3}
   39 |     u += User{2, 3}
      |       ~~
   40 | }
