Added test for string types in tuples.

tests/cases/conformance/types/stringLiteral/stringLiteralTypesAndTuples01.ts

@@ -0,0 +1,20 @@
+// @declaration: true
+
+// Should all be strings.
+let [hello, brave, newish, world] = ["Hello", "Brave", "New", "World"];
+
+type RexOrRaptor = "t-rex" | "raptor"
+let [im, a, dinosaur]: ["I'm", "a", Dinosaur] = ['I\'m', 'a', 't-rex'];
+
+rawr(dinosaur);
+
+function rawr(dino: RexOrRaptor) {
+    if (dino === "t-rex") {
+        return "ROAAAAR!";
+    }
+    if (dino === "raptor") {
+        return "yip yip!";
+    }
+
+    throw "Unexpected " + dino;
+}