Add test case

sandersn · sandersn · commit 0806461ee1e6 · 2015-12-07T09:44:55.000-08:00
diff --git a/tests/cases/conformance/expressions/typeGuards/typePredicateUnions.ts b/tests/cases/conformance/expressions/typeGuards/typePredicateUnions.ts
@@ -0,0 +1,18 @@
+function isA<A>(x: any, y: any): x is A | y is B {
+    return false;
+}
+
+var x: number | number[];
+var y: string | string[];
+var num: number;
+var nums: number[];
+var strOrStrs: string | string[];
+
+if (isA<number>(x, y)) {
+    num = x;
+    strOrStrs = y;
+}
+else {
+    nums = x;
+    strOrStrs = y;
+}
