vlib/v/checker/tests/mut_receiver.vv:5:4: warning: use `(mut f Foo)` instead of `(f mut Foo)`
    3 |     name string
    4 | }
    5 | fn (f mut Foo) info() {
      |    ~~~~~~~~~~~
    6 |     f.name = 'foo'
    7 | }
vlib/v/checker/tests/mut_receiver.vv:8:4: error: use `(mut f Foo)` or `(f &Foo)` instead of `(mut f &Foo)`
    6 |     f.name = 'foo'
    7 | }
    8 | fn (mut f &Foo) info2() {
      |    ~~~~~~~~~~~~
    9 |     f.name = 'foo'
   10 | }
