Adding new tests

tests/baselines/reference/restElementWithInitializer1.errors.txt

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+tests/cases/conformance/es6/destructuring/restElementWithInitializer1.ts(2,11): error TS1185: A rest element cannot have an initializer.
+
+
+==== tests/cases/conformance/es6/destructuring/restElementWithInitializer1.ts (1 errors) ====
+    var a: number[];
+    var [...x = a] = a;  // Error, rest element cannot have initializer
+              ~
+!!! error TS1185: A rest element cannot have an initializer.
+    

tests/baselines/reference/restElementWithInitializer2.errors.txt

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+tests/cases/conformance/es6/destructuring/restElementWithInitializer2.ts(3,5): error TS2364: Invalid left-hand side of assignment expression.
+
+
+==== tests/cases/conformance/es6/destructuring/restElementWithInitializer2.ts (1 errors) ====
+    var a: number[];
+    var x: number[];
+    [...x = a] = a;  // Error, rest element cannot have initializer
+        ~~~~~
+!!! error TS2364: Invalid left-hand side of assignment expression.
+    

tests/baselines/reference/restElementWithInitializer2.js

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+//// [restElementWithInitializer2.ts]
+var a: number[];
+var x: number[];
+[...x = a] = a;  // Error, rest element cannot have initializer
+
+
+//// [restElementWithInitializer2.js]
+var a;
+var x;
+x = a = a.slice(0); // Error, rest element cannot have initializer

tests/cases/conformance/es6/destructuring/restElementWithInitializer1.ts

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+var a: number[];
+var [...x = a] = a;  // Error, rest element cannot have initializer

tests/cases/conformance/es6/destructuring/restElementWithInitializer2.ts

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+var a: number[];
+var x: number[];
+[...x = a] = a;  // Error, rest element cannot have initializer