How does the original [go tip] write cool coherent operations?

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Structure-body method for defining coherent operations

package toytype Toy struct {nick   stringshape  stringcolor  stringheight int}func (t *Toy) SetNick(nick string) *Toy {t.nick = nickreturn t}func (t *Toy) SetShape(shape string) *Toy {t.shape = shapereturn t}func (t *Toy) SetColor(color string) *Toy {t.color = colorreturn t}func (t *Toy) SetHeight(height int) *Toy {t.height = heightreturn t}

Coherent invocation

package main func main() {var t = new(Toy).SetNick("nick").SetShape("dog").SetColor("white").SetHeight(10)_ = t}