CC @golang/tools-team

Maybe I don't have relevant contextual information, why is the max function allowed to accept a parameter, and what is its actual meaning? Is there any real scenario where only one parameter needs to be passed?

the function signature is max[T cmp.Ordered](x T, y ...T) T

@leaxoy

why is the max function allowed to accept a parameter, and what is its actual meaning? Is there any real scenario where only one parameter needs to be passed?

At least, min/max can be used as poor men's eval of ordered expressions. For example,
in the following code, the foo call may return 3 or 4, but the bar call is guaranteed to return 3.

package main

func foo(k int) int {
	f := func() int {
		k++
		return k
	}
	return k + f()
}

func bar(k int) int {
	f := func() int {
		k++
		return k
	}
	return min(k) + f()
}

func main() {
	println(foo(1), bar(1))
}

:D

Similarly, append can be used poor men's eval of slice expressions: https://go.dev/play/p/9T0KcZaYtuY

This seems closely analogous to #60448, which added a similar vet check for append. (Too bad we called it append and not missingarg or something more general...)

Maybe I don't have relevant contextual information, why is the max function allowed to accept a parameter, and what is its actual meaning? Is there any real scenario where only one parameter needs to be passed?

This was raised during discussion #59488 (comment) and there was no obvious reason to prohibit it #59488 (comment)
Now there is a reason.