Wu has straight up stolen trait behavior from Rust and Pony. Traits can be thought of as behavior criteria for a struct, defined as a set of methods one can expect to find on a struct.

A trait can be defined like so:

Movable: trait {
    move: fun(self, dx: float, dy: foat)

Thus, anything that implements Movablewill have to have a method named movethat takes the given parameters on it.

We can implement traits on a struct like this:

Vector: struct {
    x: float
    y: float

implement Vector: Movable {
    move: fun(self, dx: float, dy: float) {
        self x += dx
        self y += dy   

Now, when we try to move a Vector using the movemethod it works perfectly:

point := new Vector {
    x: 100
    y: 100

point move(10, 5)

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