type Employee int 
const (
    UnknownEmployee Employee = iota
    Phone
)

type Contact int
const (
    UnknownContact Contact = iota
    Phone
)

Having the above gunk definitions on same package fails, because Phone is redeclared as per gunk (as it follows golang syntax)

This can overcome this by adding prefix to phone on both enums, like EmployeePhone and ContactPhone, but after genrating protoc bindings, the names would look like double prefixed Employee_EmployeePhone.

Add support to define a enum name through gunk annotation or some how to match the proto's naming convension.