It would be very useful if the go:generate command gained the ability to pass along file and line to the invoked tool, to avoid redundant definitions.

For example:

//go:generate -l stringer
type Pill int

const (
    Placebo Pill = iota
    Aspirin
)

Could pass along something like "Pill.go:42" to stringer.

Alternately, or in addition to, one could imagine //go:generate supporting a mode where it must be defined right before a type, variable or function, such that it could pass along that information to the tool.