赋值是一个复制操作，所以：

my @a = something;

创建一个Arrayin @a，迭代something并将每个元素存储在 中@a。如果改为使用绑定：

my @list := (2,) but "bar";
put @list.Str;

然后将带有 mixin 的列表绑定到符号@list，输出为：

bar

• No, it goes on the `List` as a whole. In the case where we assign, the `List` on the right is only used for its contents, then becomes unreachable.
• `$something but "a string"` is short for `$something but role { method Str() { "a string" } }` - that is, it changes how the object will coerce to a `Str`. The `print` function coerces its argument to `Str`. The `put` function - short for "print using terminator" - also does, since it's a form of `print`. By contrast, `say` calls the `gist` method, as in "give me [the gist of it](https://dictionary.cambridge.org/dictionary/english/gist)". The role we
  mixed in changes nothing about that.
• But that means that the mix-in goes to the first element?