foo(bar 1 do end, 2)
                ^ invalid comma
                  ^ unexpected integer; expected a `)` to close the arguments
                  ^ unexpected integer, expecting end-of-input
                   ^ unexpected ')', expecting end-of-input
                   ^ unexpected ')', ignoring it

foo(bar 1 do end,)
                ^ invalid comma

foo(1, bar 2 do end)
           ^ unexpected integer; expected a `)` to close the arguments
           ^ unexpected integer, expecting end-of-input
             ^~ unexpected 'do', expecting end-of-input
             ^~ unexpected 'do', ignoring it
                ^~~ unexpected 'end', ignoring it
                   ^ unexpected ')', ignoring it

foo(1, bar 2)
           ^ unexpected integer; expected a `)` to close the arguments
           ^ unexpected integer, expecting end-of-input
            ^ unexpected ')', expecting end-of-input
            ^ unexpected ')', ignoring it