vlib/v/checker/tests/enum_field_value_duplicate_a.vv:3:10: error: enum value `0` already exists
    1 | enum Color {
    2 |     red
    3 |     green = 0
      |             ^
    4 |     blue  = 1
    5 |     alpha = 1
Details: use `@[_allow_multiple_values]` attribute to allow multiple enum values. Use only when it is needed
vlib/v/checker/tests/enum_field_value_duplicate_a.vv:5:10: error: enum value `1` already exists
    3 |     green = 0
    4 |     blue  = 1
    5 |     alpha = 1
      |             ^
    6 | }
Details: use `@[_allow_multiple_values]` attribute to allow multiple enum values. Use only when it is needed