type A interface {    f()}type B struct {    A}type C struct {    Imp A}func main() {    b := B{}    c := C{}    //b can be directly assigned to the A interface, but c prompts that it cannot be assigned    var ab A = b    //Cannot use 'c' (type C) as type A in assignment Type does not implement 'A' as some methods are missing: f()     var ac A = c}B結(jié)構(gòu)和C結(jié)構(gòu)有什么區(qū)別？在 Go 表中使用類型聲明但沒(méi)有顯式字段名稱的字段稱為嵌入字段。嵌入字段必須指定為類型名稱 T 或指向非接口類型名稱 *T 的指針，并且 T 本身可能不是指針類型。非限定類型名稱充當(dāng)字段名稱。