vlib/v/checker/tests/mut_parms_struct_param_err.vv:8:17: error: declaring a mutable parameter that accepts a struct with the `@[params]` attribute is not allowed
    6 | }
    7 | 
    8 | fn foo(mut opts Params) bool {
      |                 ~~~~~~
    9 |     return opts.a
   10 | }