{"bug5a", "{{.Err}}", "erroozle", tVal, true},
	// Args need to be indirected and dereferenced sometimes.
	{"bug6a", "{{vfunc .V0 .V1}}", "vfunc", tVal, true},
	{"bug6b", "{{vfunc .V0 .V0}}", "vfunc", tVal, true},
	{"bug6c", "{{vfunc .V1 .V0}}", "vfunc", tVal, true},
	{"bug6d", "{{vfunc .V1 .V1}}", "vfunc", tVal, true},
	// Legal parse but illegal execution: non-function should have no arguments.

	}
}

type BugD struct { // Same as BugA after tagging.
	XXX string `json:"S"`
}

// BugD's tagged S field should dominate BugA's.
type BugY struct {
	BugA
	BugD
}

// Test that a field with a tag dominates untagged fields.
func TestTaggedFieldDominates(t *testing.T) {
	v := BugY{
		BugA{"BugA"},
		BugD{"BugD"},
	}
	b, err := Marshal(v)
	if err != nil {