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!7 abstract sclass Prop implements IStatement, IFieldsToList {} static withToList record $HappensBefore$(A event1, B event2) extends Prop {} static withToList record $HappensAtDay$(A event, B y) extends Prop {} static withToList record $LessThan$(A x, A y) extends Prop {} // we can fully define a statement on primitive values // full define $LessThan(int x, int y) = x < y; // we can output a variable // full define $LessThan(int x, var y) = y := any int bigger than x; /* Event 1 happens before event 2 := vars {event 1, event 2, X, Y} Event 1 happens at day X. Event 2 happens at day Y. X < Y. */ static Bool checkProposition(Prop p) { /*if (p cast $LessThan$) if (matchRecordWithTypes(p, int.class, int.class)) ret (int) p.x < (int) p.y;*/ if p is $LessThan$(int x, int y) { ret x < y; } null; } p-exp { assertEqualsVerbose(true, checkProposition($LessThan$(1, 5))); assertEqualsVerbose(false, checkProposition($LessThan$(5, 1))); assertEqualsVerbose(null, checkProposition($LessThan$("what", "ever"))); }