examples/org.eclipse.epsilon.eunit.examples.evl/tree-constraints.evl

context Tree {
  constraint LabelsStartWithT {
    check   : self.label.startsWith("t")
    message : "Label starts with t"
  }

  critique LabelsEndInN {
    check   : self.label.endsWith("n")
    message : "Label ends with n"
  }
}