Make semicolon optional in do-while in >=ES6

acorn.js

@@ -1603,7 +1603,11 @@
     labels.pop();
     expect(_while);
     node.test = parseParenExpression();
-    semicolon();
+    if (options.ecmaVersion >= 6) {
+      eat(_semi);
+    } else {
+      semicolon();
+    }
     return finishNode(node, "DoWhileStatement");
   }
 

test/tests-harmony.js

@@ -13405,6 +13405,52 @@ test("/[a-z]/u", {
   ecmaVersion: 6
 });
 
+
+test("do {} while (false) foo();", {
+  type: "Program",
+  start: 0,
+  end: 26,
+  body: [
+    {
+      type: "DoWhileStatement",
+      start: 0,
+      end: 19,
+      body: {
+        type: "BlockStatement",
+        start: 3,
+        end: 5,
+        body: []
+      },
+      test: {
+        type: "Literal",
+        start: 13,
+        end: 18,
+        value: false,
+        raw: "false"
+      }
+    },
+    {
+      type: "ExpressionStatement",
+      start: 20,
+      end: 26,
+      expression: {
+        type: "CallExpression",
+        start: 20,
+        end: 25,
+        callee: {
+          type: "Identifier",
+          start: 20,
+          end: 23,
+          name: "foo"
+        },
+        arguments: []
+      }
+    }
+  ]
+}, {
+  ecmaVersion: 6
+});
+
 // Harmony Invalid syntax
 
 testFail("0o", "Expected number in radix 8 (1:2)", {ecmaVersion: 6});