foo, bar := someFunc(baz)
Wouldn't your editor, mouseless though it may be, provide for that? Does ctags not work with vi?
And why use vi over vim?
However, tools improve and you're denying yourself productivity benefits. One of the advantages of a statically typed language is that the computer knows the type of the arguments. I love environments that allow me to 'mouse over' a function or variable etc. and tell me exactly what it is (and allow me to navigate to its definition). You don't have to use a mouse but what's the disadvantage in having alternatives to keyboard shortcuts where appropriate?