In this specific case the macro isn’t very useful since you can easily write `trait T { ... }` yourself. They tend to be more useful when there is a lot of simi

In this specific case the macro isn’t very useful since you can easily write `trait T { ... }` yourself. They tend to be more useful when there is a lot of similar boilerplate code that only differ in a few ways. A macro can cut down most of that repetition. They can also be used to provide pseudo “literals” like the vec! macro does for the Vec data type.