separate compiler and plugin tests

compiler/testData/psi/examples/util/Comparison.jet

@@ -0,0 +1,19 @@
+type Comparison<in T> = fun (T, T) : Int
+
+fun naturalOrder<in T : Comparable<T>>(a : T, b : T) : Int = a.compareTo(b)
+
+fun castingNaturalOrder(a : Object, b : Object) : Int = (a as Comparable<Object>).compareTo(b as Comparable<Object>)
+
+enum class ComparisonResult {
+  LS; EQ; GR
+}
+
+type MatchableComparison<in T> = fun (T, T) : ComparisonResult
+
+fun asMatchableComparison<T>(cmp : Comparison<T>) : MatchableComparison<T> = {(a, b) =>
+  val res = cmp(a, b)
+  if (res == 0) return ComparisonResult.EQ
+  if (res < 0) return ComparisonResult.LS
+  return ComparisonResult.GR
+}
+