vlib/v/checker/tests/infix_sumtype_in_array_err.vv:15:7: error: left operand to `in` does not match the array element type: expected `rune`, not `RuneAliasOrOtherType`
   13 |     match x {
   14 |         RuneAlias {
   15 |             if x in whitespace {
      |                ~~~~~~~~~~~~~~~
   16 |                 // doing `if x as RuneAlias in whitespace` here
   17 |                 // works but it should be doing that automatically
