[go-nuts] Can a struct be made comparable?

['Mark' via golang-nuts]

I have a package which has a function `Do[T comparable](a, b []T) Result`.
I have a struct:
```go
type N struct {
  x int
  y int
  t string
}
```
Is it possible to make `N` comparable; in particular by a field of my 
choice, e.g., `t`?

Or will I have to make, say, `DoFunc(a, b []N, eq func(i, j N) bool) 
Result` with, say,
`func eq(i, j N) { return i.t == j.t }`?

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