Added test.

tests/cases/compiler/mapOnTupleTypes01.ts

@@ -0,0 +1,45 @@
+// @declaration: true
+// @noImplicitAny: true
+// @strictNullChecks: true
+
+export let mapOnLooseArrayLiteral = [1, 2, 3, 4].map(n => n * n);
+
+// Length 1
+
+let numTuple: [number] = [1];
+export let a = numTuple.map(x => x * x);
+
+// Length 2
+
+let numNum: [number, number] = [    100,     100];
+let strStr: [string, string] = ["hello", "hello"];
+let numStr: [number, string] = [    100, "hello"];
+
+export let b = numNum.map(n => n * n);
+export let c = strStr.map(s => s.charCodeAt(0));
+export let d = numStr.map(x => x);
+
+// Length 3
+
+let numNumNum: [number, number, number] = [1, 2, 3];
+
+export let e = numNumNum.map(n => n * n);
+
+// Length 4
+
+let numNumNumNum: [number, number, number, number] = [1, 2, 3, 4];
+
+export let f = numNumNumNum.map(n => n * n);
+
+// Length 5
+
+let numNumNumNumNum: [number, number, number, number, number] = [1, 2, 3, 4, 5];
+
+export let g = numNumNumNumNum.map(n => n * n);
+
+
+// Length 6
+
+let numNumNumNumNumNum: [number, number, number, number, number, number] = [1, 2, 3, 4, 5, 6];
+
+export let h = numNumNumNumNum.map(n => n * n);

tests/cases/compiler/mapOnTupleTypes02.ts

@@ -0,0 +1,9 @@
+// @declaration: true
+// @noImplicitAny: true
+// @strictNullChecks: true
+
+export type Point = [number, number];
+
+export function increment(point: Point) {
+  return point.map(d => d + 1);
+}