Rename ErrorType to ErrorProtocol

test/Interpreter/enum_ErrorProtocol.swift

@@ -0,0 +1,27 @@
+// RUN: %target-run-simple-swift
+// REQUIRES: executable_test
+
+import StdlibUnittest
+
+enum ClericalErrorDomain: ErrorProtocol {
+  case MisplacedDocument(name: String)
+  case AccidentallyErasedTape(fromMinute: Double, toMinute: Double)
+}
+
+enum EmptyErrorDomain: ErrorProtocol {}
+
+var EnumErrorProtocol = TestSuite("Enum ErrorProtocol derivation")
+
+EnumErrorProtocol.test("default codes") {
+  let a: ClericalErrorDomain = .MisplacedDocument(name: "check-in times.doc")
+  let b: ClericalErrorDomain
+    = .AccidentallyErasedTape(fromMinute: 5, toMinute: 23.5)
+  expectEqual(a._domain, "main.ClericalErrorDomain")
+  expectEqual(b._domain, "main.ClericalErrorDomain")
+
+  expectEqual(a._code, 0)
+  expectEqual(b._code, 1)
+}
+
+runAllTests()
+