const (
		zzzzzz	= 1
		z	= 2
		zzz	= 3
	)
	// some entries have a type
	const (
		xxxxxx			= 1
		x			= 2
		xxx			= 3
		yyyyyyyy	float	= iota
		yyyy			= "bar"
		yyy
		yy	= 2
	)
}

func _() {
	// no entry has a type
	var (
		zzzzzz	= 1
		z	= 2
		zzz	= 3
	)
	// no entry has a value
	var (
		_	int
		_	float
		_	string

// Test that panic message is not clobbered.
// See issue 30150.
func TestDoublePanic(t *testing.T) {
	output := runTestProg(t, "testprog", "DoublePanic", "GODEBUG=clobberfree=1")
	wants := []string{"panic: XXX", "panic: YYY"}
	for _, want := range wants {
		if !strings.Contains(output, want) {
			t.Errorf("output:\n%s\n\nwant output containing: %s", output, want)
		}
	}
}

You can have attributes on both the requested dependency _or_ the substitute and the substitution is not limited to `platform`: you can actually specify the whole set of dependency attributes using the `variant` notation.