Initial Dever 0.0.1

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"))
+}