vlib/v/checker/tests/struct_iter_generic_invalid_infer_err.vv:25:6: error: cannot infer from generic type `K`
   23 |     }
   24 | 
   25 |     for squared in iter {
      |         ~~~~~~~
   26 |         println(squared)
   27 |     }
Details: type parameters defined by `next()` method should be bounded by method owner type