vlib/v/parser/tests/method_decl_on_non_local_array.vv:1:7: error: cannot define new methods on non-local type []int. Define an alias and use that instead like `type AliasName = []int` 
    1 | fn (a []int) get_number() int { 
      |       ~~~~~
    2 |     return 1
    3 | }