vlib/v/checker/tests/enum_field_value_duplicate_f.vv:6:8: error: enum value `2` already exists
    4 | enum Foo {
    5 |     foo = x
    6 |     bar = y
      |           ^
    7 | }
Details: use `@[_allow_multiple_values]` attribute to allow multiple enum values. Use only when it is needed