Initial Dever 0.0.1

test/rust/fixtures/package/calc/batch.dever

@@ -0,0 +1,19 @@
+public apply(action: handler(value: Int) (answer: Int), value: Int) (answer: Int) {
+  answer = action(value)
+}
+
+public mapValues(values: List<Int>) (answer: List<Int>) {
+  answer = each(calc.value.adjust, values)
+}
+
+public total(values: List<Int>) (answer: Int) {
+  answer = reduce(add, values, 0)
+}
+
+add(value: Int, state: Int) (answer: Int) {
+  answer = state + calc.value.adjust(value)
+}
+
+public verify() (answer: Bool) {
+  answer = total([1, 2, 3]) == 9
+}

test/rust/fixtures/package/calc/value.dever

@@ -0,0 +1,24 @@
+public type Row {
+  id: Id
+  count: Int
+}
+
+public type Problem {
+  error Rejected(message: Text)
+}
+
+public adjust(value: Int) (answer: Int) {
+  answer = value + 1
+}
+
+public make(value: Int) (row: Row) {
+  row = Row { id = dever.id.fromText("雪")
+    count = value }
+}
+
+public positive(value: Int >= 0) (answer: Int) {
+  answer = value
+}
+public positive(value: Int < 0) (answer: Int) {
+  fail(Problem.Rejected("negative"))
+}