diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index db2c09e34b..4e1d4ccd9b 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -6132,16 +6132,14 @@ namespace ts {
             }
 
             // Parses out a JSDoc type expression.
-            export function parseJSDocTypeExpression(): JSDocTypeExpression;
-            export function parseJSDocTypeExpression(requireBraces: true): JSDocTypeExpression | undefined;
-            export function parseJSDocTypeExpression(requireBraces?: boolean): JSDocTypeExpression | undefined {
+            export function parseJSDocTypeExpression(mayOmitBraces?: boolean): JSDocTypeExpression {
                 const result = <JSDocTypeExpression>createNode(SyntaxKind.JSDocTypeExpression, scanner.getTokenPos());
 
-                if (!parseExpected(SyntaxKind.OpenBraceToken) && requireBraces) {
-                    return undefined;
-                }
+                const hasBrace = (mayOmitBraces ? parseOptional : parseExpected)(SyntaxKind.OpenBraceToken);
                 result.type = doInsideOfContext(NodeFlags.JSDoc, parseType);
-                parseExpected(SyntaxKind.CloseBraceToken);
+                if (!mayOmitBraces || hasBrace) {
+                    parseExpected(SyntaxKind.CloseBraceToken);
+                }
 
                 fixupParentReferences(result);
                 return finishNode(result);
@@ -6597,7 +6595,7 @@ namespace ts {
                     const result = <JSDocTypeTag>createNode(SyntaxKind.JSDocTypeTag, atToken.pos);
                     result.atToken = atToken;
                     result.tagName = tagName;
-                    result.typeExpression = parseJSDocTypeExpression(/*requireBraces*/ true);
+                    result.typeExpression = parseJSDocTypeExpression(/*mayOmitBraces*/ true);
                     return finishNode(result);
                 }
 
diff --git a/src/compiler/scanner.ts b/src/compiler/scanner.ts
index 8dc5a10c62..78df166633 100644
--- a/src/compiler/scanner.ts
+++ b/src/compiler/scanner.ts
@@ -1873,7 +1873,17 @@ namespace ts {
                     return token = SyntaxKind.CommaToken;
                 case CharacterCodes.dot:
                     pos++;
+                    if (text.substr(tokenPos, pos + 2) === "...") {
+                        pos += 2;
+                        return token = SyntaxKind.DotDotDotToken;
+                    }
                     return token = SyntaxKind.DotToken;
+                case CharacterCodes.exclamation:
+                    pos++;
+                    return token = SyntaxKind.ExclamationToken;
+                case CharacterCodes.question:
+                    pos++;
+                    return token = SyntaxKind.QuestionToken;
             }
 
             if (isIdentifierStart(ch, ScriptTarget.Latest)) {
@@ -1881,6 +1891,7 @@ namespace ts {
                 while (isIdentifierPart(text.charCodeAt(pos), ScriptTarget.Latest) && pos < end) {
                     pos++;
                 }
+                tokenValue = text.substring(tokenPos, pos);
                 return token = SyntaxKind.Identifier;
             }
             else {
diff --git a/tests/baselines/reference/jsdocTypedefMissingType.errors.txt b/tests/baselines/reference/jsdocTypedefMissingType.errors.txt
index b5b29a47ed..ef1141a8e8 100644
--- a/tests/baselines/reference/jsdocTypedefMissingType.errors.txt
+++ b/tests/baselines/reference/jsdocTypedefMissingType.errors.txt
@@ -1,8 +1,7 @@
 /a.js(2,14): error TS8021: JSDoc '@typedef' tag should either have a type annotation or be followed by '@property' or '@member' tags.
-/a.js(12,11): error TS1005: '{' expected.
 
 
-==== /a.js (2 errors) ====
+==== /a.js (1 errors) ====
     // Bad: missing a type
     /** @typedef T */
                  ~
@@ -17,7 +16,5 @@
      */
     
     /** @type Person */
-              ~~~~~~
-!!! error TS1005: '{' expected.
     const person = { name: "" };
     
\ No newline at end of file
diff --git a/tests/baselines/reference/jsdocTypedefMissingType.types b/tests/baselines/reference/jsdocTypedefMissingType.types
index 4a3f796ccb..18cd68abfc 100644
--- a/tests/baselines/reference/jsdocTypedefMissingType.types
+++ b/tests/baselines/reference/jsdocTypedefMissingType.types
@@ -14,8 +14,8 @@ const t = 0;
 
 /** @type Person */
 const person = { name: "" };
->person : { [x: string]: any; name: string; }
->{ name: "" } : { [x: string]: any; name: string; }
+>person : { name: string; }
+>{ name: "" } : { name: string; }
 >name : string
 >"" : ""
 
diff --git a/tests/baselines/reference/malformedTags.types b/tests/baselines/reference/malformedTags.types
index b4f7daecd8..c3af959586 100644
--- a/tests/baselines/reference/malformedTags.types
+++ b/tests/baselines/reference/malformedTags.types
@@ -5,7 +5,7 @@
  * @type Function
  */
 var isArray = Array.isArray;
->isArray : (arg: any) => arg is any[]
+>isArray : Function
 >Array.isArray : (arg: any) => arg is any[]
 >Array : ArrayConstructor
 >isArray : (arg: any) => arg is any[]
diff --git a/tests/baselines/reference/user/chrome-devtools-frontend.log b/tests/baselines/reference/user/chrome-devtools-frontend.log
index de98c4f608..cfe2154c33 100644
--- a/tests/baselines/reference/user/chrome-devtools-frontend.log
+++ b/tests/baselines/reference/user/chrome-devtools-frontend.log
@@ -50,9 +50,10 @@ node_modules/chrome-devtools-frontend/front_end/Runtime.js(478,17): error TS2503
 node_modules/chrome-devtools-frontend/front_end/Runtime.js(488,17): error TS2503: Cannot find namespace 'Runtime'.
 node_modules/chrome-devtools-frontend/front_end/Runtime.js(489,17): error TS2503: Cannot find namespace 'Runtime'.
 node_modules/chrome-devtools-frontend/front_end/Runtime.js(502,16): error TS2503: Cannot find namespace 'Runtime'.
-node_modules/chrome-devtools-frontend/front_end/Runtime.js(527,9): error TS2322: Type 'Window' is not assignable to type 'new () => any'.
-  Type 'Window' provides no match for the signature 'new (): any'.
-node_modules/chrome-devtools-frontend/front_end/Runtime.js(527,55): error TS1005: '{' expected.
+node_modules/chrome-devtools-frontend/front_end/Runtime.js(527,9): error TS2322: Type 'Function' is not assignable to type 'new () => any'.
+  Type 'Function' provides no match for the signature 'new (): any'.
+node_modules/chrome-devtools-frontend/front_end/Runtime.js(527,49): error TS2352: Type 'Window' cannot be converted to type 'Function'.
+  Property 'apply' is missing in type 'Window'.
 node_modules/chrome-devtools-frontend/front_end/Runtime.js(539,20): error TS2351: Cannot use 'new' with an expression whose type lacks a call or construct signature.
 node_modules/chrome-devtools-frontend/front_end/Runtime.js(577,10): error TS2339: Property 'name' does not exist on type '(Anonymous class)'.
 node_modules/chrome-devtools-frontend/front_end/Runtime.js(582,10): error TS2339: Property 'extensions' does not exist on type '(Anonymous class)'.
@@ -332,7 +333,7 @@ node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(301,5): error TS2304: Cannot find name 'UI'.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(302,23): error TS2339: Property 'tabIndex' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(311,5): error TS2304: Cannot find name 'UI'.
-node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(314,15): error TS1005: '{' expected.
+node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(314,23): error TS2503: Cannot find namespace 'Accessibility'.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(323,23): error TS2339: Property 'style' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(330,27): error TS2339: Property 'createChild' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(357,15): error TS2503: Cannot find namespace 'Accessibility'.
@@ -8542,7 +8543,7 @@ node_modules/chrome-devtools-frontend/front_end/coverage/CoverageDecorationManag
 node_modules/chrome-devtools-frontend/front_end/coverage/CoverageDecorationManager.js(247,15): error TS2503: Cannot find namespace 'Coverage'.
 node_modules/chrome-devtools-frontend/front_end/coverage/CoverageDecorationManager.js(248,15): error TS2503: Cannot find namespace 'Coverage'.
 node_modules/chrome-devtools-frontend/front_end/coverage/CoverageDecorationManager.js(255,15): error TS2503: Cannot find namespace 'Common'.
-node_modules/chrome-devtools-frontend/front_end/coverage/CoverageDecorationManager.js(258,34): error TS1005: '{' expected.
+node_modules/chrome-devtools-frontend/front_end/coverage/CoverageDecorationManager.js(258,35): error TS2503: Cannot find namespace 'Workspace'.
 node_modules/chrome-devtools-frontend/front_end/coverage/CoverageDecorationManager.js(259,39): error TS2304: Cannot find name 'Coverage'.
 node_modules/chrome-devtools-frontend/front_end/coverage/CoverageDecorationManager.js(263,1): error TS2304: Cannot find name 'Coverage'.
 node_modules/chrome-devtools-frontend/front_end/coverage/CoverageDecorationManager.js(268,1): error TS2304: Cannot find name 'Coverage'.
@@ -8744,7 +8745,7 @@ node_modules/chrome-devtools-frontend/front_end/coverage/CoverageView.js(220,1):
 node_modules/chrome-devtools-frontend/front_end/coverage/CoverageView.js(223,15): error TS2503: Cannot find namespace 'UI'.
 node_modules/chrome-devtools-frontend/front_end/coverage/CoverageView.js(229,5): error TS2304: Cannot find name 'UI'.
 node_modules/chrome-devtools-frontend/front_end/coverage/CoverageView.js(230,21): error TS2304: Cannot find name 'UI'.
-node_modules/chrome-devtools-frontend/front_end/coverage/CoverageView.js(231,59): error TS1005: '{' expected.
+node_modules/chrome-devtools-frontend/front_end/coverage/CoverageView.js(231,60): error TS2503: Cannot find namespace 'Coverage'.
 node_modules/chrome-devtools-frontend/front_end/coverage/CoverageView.js(237,15): error TS2503: Cannot find namespace 'Coverage'.
 node_modules/chrome-devtools-frontend/front_end/coverage_test_runner/CoverageTestRunner.js(10,1): error TS2304: Cannot find name 'CoverageTestRunner'.
 node_modules/chrome-devtools-frontend/front_end/coverage_test_runner/CoverageTestRunner.js(11,3): error TS2304: Cannot find name 'UI'.
@@ -13261,7 +13262,6 @@ node_modules/chrome-devtools-frontend/front_end/formatter_worker/FormatterWorker
 node_modules/chrome-devtools-frontend/front_end/formatter_worker/FormatterWorker.js(46,81): error TS2708: Cannot use namespace 'FormatterWorker' as a value.
 node_modules/chrome-devtools-frontend/front_end/formatter_worker/FormatterWorker.js(51,3): error TS2322: Type '(line: string, callback: (arg0: string, arg1: string, arg2: number, arg3: number) => any) => void' is not assignable to type '(arg0: string) => any'.
 node_modules/chrome-devtools-frontend/front_end/formatter_worker/FormatterWorker.js(54,1): error TS2708: Cannot use namespace 'FormatterWorker' as a value.
-node_modules/chrome-devtools-frontend/front_end/formatter_worker/FormatterWorker.js(58,26): error TS1005: '{' expected.
 node_modules/chrome-devtools-frontend/front_end/formatter_worker/FormatterWorker.js(64,7): error TS2708: Cannot use namespace 'FormatterWorker' as a value.
 node_modules/chrome-devtools-frontend/front_end/formatter_worker/FormatterWorker.js(67,7): error TS2708: Cannot use namespace 'FormatterWorker' as a value.
 node_modules/chrome-devtools-frontend/front_end/formatter_worker/FormatterWorker.js(70,7): error TS2708: Cannot use namespace 'FormatterWorker' as a value.
@@ -14928,7 +14928,6 @@ node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(49,
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(51,9): error TS2304: Cannot find name 'LayerViewer'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(54,32): error TS2339: Property 'contentElement' does not exist on type '(Anonymous class)'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(66,32): error TS2304: Cannot find name 'LayerViewer'.
-node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(68,15): error TS1005: '{' expected.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(76,15): error TS2503: Cannot find namespace 'SDK'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(89,15): error TS2503: Cannot find namespace 'SDK'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(98,5): error TS2304: Cannot find name 'UI'.
@@ -15008,7 +15007,11 @@ node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(547
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(548,33): error TS2304: Cannot find name 'LayerViewer'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(552,74): error TS2304: Cannot find name 'LayerViewer'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(557,28): error TS2304: Cannot find name 'LayerViewer'.
+node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(559,48): error TS2339: Property 'image' does not exist on type 'WebGLTexture'.
+node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(561,49): error TS2339: Property 'image' does not exist on type 'WebGLTexture'.
+node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(561,94): error TS2339: Property 'image' does not exist on type 'WebGLTexture'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(565,25): error TS2304: Cannot find name 'LayerViewer'.
+node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(566,97): error TS2339: Property 'image' does not exist on type 'WebGLTexture'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(576,15): error TS2503: Cannot find namespace 'LayerViewer'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(590,15): error TS2339: Property 'isShowing' does not exist on type '(Anonymous class)'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(595,34): error TS2339: Property 'contentElement' does not exist on type '(Anonymous class)'.
@@ -18482,9 +18485,8 @@ node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(847,29): e
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(859,25): error TS2304: Cannot find name 'UI'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(870,27): error TS2304: Cannot find name 'UI'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(903,42): error TS2503: Cannot find namespace 'PerfUI'.
-node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(907,17): error TS1005: '{' expected.
-node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(915,27): error TS2339: Property 'peekLast' does not exist on type '{ [x: string]: any; nestingLevel: number; visible: boolean; }[]'.
-node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(919,45): error TS2339: Property 'peekLast' does not exist on type '{ [x: string]: any; nestingLevel: number; visible: boolean; }[]'.
+node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(915,27): error TS2339: Property 'peekLast' does not exist on type '{ nestingLevel: number; visible: boolean; }[]'.
+node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(919,45): error TS2339: Property 'peekLast' does not exist on type '{ nestingLevel: number; visible: boolean; }[]'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(931,15): error TS2503: Cannot find namespace 'PerfUI'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(935,12): error TS2304: Cannot find name 'UI'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(940,15): error TS2503: Cannot find namespace 'PerfUI'.
@@ -18496,9 +18498,8 @@ node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1004,18):
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1090,18): error TS2304: Cannot find name 'PerfUI'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1117,15): error TS2503: Cannot find namespace 'PerfUI'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1165,46): error TS2304: Cannot find name 'PerfUI'.
-node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1167,15): error TS1005: '{' expected.
-node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1176,27): error TS2339: Property 'peekLast' does not exist on type '{ [x: string]: any; nestingLevel: number; visible: boolean; }[]'.
-node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1182,43): error TS2339: Property 'peekLast' does not exist on type '{ [x: string]: any; nestingLevel: number; visible: boolean; }[]'.
+node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1176,27): error TS2339: Property 'peekLast' does not exist on type '{ nestingLevel: number; visible: boolean; }[]'.
+node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1182,43): error TS2339: Property 'peekLast' does not exist on type '{ nestingLevel: number; visible: boolean; }[]'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1273,25): error TS2339: Property 'style' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1286,19): error TS2339: Property 'constrain' does not exist on type 'NumberConstructor'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/FlameChart.js(1376,1): error TS2304: Cannot find name 'PerfUI'.
@@ -31622,7 +31623,7 @@ node_modules/chrome-devtools-frontend/front_end/timeline/TimelineDetailsView.js(
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineDetailsView.js(24,20): error TS2304: Cannot find name 'Timeline'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineDetailsView.js(26,38): error TS2304: Cannot find name 'UI'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineDetailsView.js(31,37): error TS2304: Cannot find name 'Common'.
-node_modules/chrome-devtools-frontend/front_end/timeline/TimelineDetailsView.js(34,15): error TS1005: '{' expected.
+node_modules/chrome-devtools-frontend/front_end/timeline/TimelineDetailsView.js(34,27): error TS2503: Cannot find namespace 'Timeline'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineDetailsView.js(38,32): error TS2304: Cannot find name 'Timeline'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineDetailsView.js(39,40): error TS2304: Cannot find name 'Common'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineDetailsView.js(42,32): error TS2304: Cannot find name 'Timeline'.
@@ -34041,7 +34042,7 @@ node_modules/chrome-devtools-frontend/front_end/timeline_model/TimelineModelFilt
 node_modules/chrome-devtools-frontend/front_end/timeline_model/TimelineModelFilter.js(40,14): error TS2304: Cannot find name 'TimelineModel'.
 node_modules/chrome-devtools-frontend/front_end/timeline_model/TimelineModelFilter.js(41,27): error TS2304: Cannot find name 'TimelineModel'.
 node_modules/chrome-devtools-frontend/front_end/timeline_model/TimelineModelFilter.js(42,14): error TS2304: Cannot find name 'TimelineModel'.
-node_modules/chrome-devtools-frontend/front_end/timeline_model/TimelineModelFilter.js(43,22): error TS1005: '{' expected.
+node_modules/chrome-devtools-frontend/front_end/timeline_model/TimelineModelFilter.js(43,23): error TS2503: Cannot find namespace 'TimelineModel'.
 node_modules/chrome-devtools-frontend/front_end/timeline_model/TimelineModelFilter.js(47,1): error TS2304: Cannot find name 'TimelineModel'.
 node_modules/chrome-devtools-frontend/front_end/timeline_model/TimelineModelFilter.js(47,61): error TS2304: Cannot find name 'TimelineModel'.
 node_modules/chrome-devtools-frontend/front_end/timeline_model/TimelineModelFilter.js(58,15): error TS2503: Cannot find namespace 'SDK'.