Add spread tests and update rest tests

Author: sandersn

tests/cases/conformance/types/rest/objectRest.ts

@@ -1,5 +1,5 @@
 // @target: es2015
-let o = { a: 1, b: 'no' }
+var o = { a: 1, b: 'no' }
 var { ...clone } = o;
 var { a, ...justB } = o;
 var { a, b: renamed, ...empty } = o;
@@ -31,3 +31,8 @@ class Removable {
 }
 var removable = new Removable();
 var { removed, ...removableRest } = removable;
+
+let computed = 'b';
+let computed2 = 'a';
+var { [computed]: stillNotGreat, [computed2]: soSo,  ...o } = o;
+({ [computed]: stillNotGreat, [computed2]: soSo, ...o } = o);

tests/cases/conformance/types/spread/objectSpreadComputedProperty.ts

@@ -0,0 +1,9 @@
+// fixes #12200
+function f() {
+    let n: number = 12;
+    let m: number = 13;
+    let a: any = null;
+    const o1 = { ...{}, [n]: n };
+    const o2 = { ...{}, [a]: n };
+    const o3 = { [a]: n, ...{}, [n]: n, ...{}, [m]: m };
+}

tests/cases/fourslash/renameObjectSpreadAssignment.ts

@@ -0,0 +1,20 @@
+/// <reference path='fourslash.ts'/>
+
+////interface A1 { a: number };
+////interface A2 { a?: number };
+////let [|a1|]: A1;
+////let [|a2|]: A2;
+////let a12 = { ...[|a1|], ...[|a2|] };
+const ranges = test.ranges();
+verify.assertHasRanges(ranges);
+
+// rename a1
+goTo.position(ranges[0].start);
+verify.renameLocations(/*findInStrings*/ false, /*findInComments*/ false, [ranges[0], ranges[2]]);
+goTo.position(ranges[2].start);
+verify.renameLocations(/*findInStrings*/ false, /*findInComments*/ false, [ranges[0], ranges[2]]);
+// rename a2
+goTo.position(ranges[1].start);
+verify.renameLocations(/*findInStrings*/ false, /*findInComments*/ false, [ranges[1], ranges[3]]);
+goTo.position(ranges[3].start);
+verify.renameLocations(/*findInStrings*/ false, /*findInComments*/ false, [ranges[1], ranges[3]]);