// so calls can be chained.
func (t *Template) Funcs(funcMap FuncMap) *Template {
	t.init()
	t.muFuncs.Lock()
	defer t.muFuncs.Unlock()
	addValueFuncs(t.execFuncs, funcMap)
	addFuncs(t.parseFuncs, funcMap)
	return t
}

// Lookup returns the template with the given name that is associated with t.