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