vlib/v/checker/tests/fn_return_fn_type_mismatch_err.vv:22:9: error: cannot use `fn (&WrongType, i64, u64) int` as type `fn (&ExpectedType, i64, u64) int` in return argument
   20 | pub fn bad_signature() Fn {
   21 |     // create closure that has nonmatching signature due to first arg. Compiler should reject it
   22 |     return fn (n &WrongType, a i64, b u64) int {
      |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   23 |         println('bad signature param0=$n')
   24 |         return 0
