diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index f37dd8db902..c63791c90eb 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -805,16 +805,30 @@ module FourSlash {
             this.scenarioActions.push('<ShowQuickInfo />');
             this.scenarioActions.push('<Verify return values of quickInfo="' + JSON.stringify(displayParts) + '"/>');
 
-            function getJsonString(object: any) {
-                return (JSON.stringify(object, /*replacer*/undefined, "    "));
+            function getDisplayPartsJson(displayParts: ts.SymbolDisplayPart[]) {
+                var result = "";
+                ts.forEach(displayParts, part => {
+                    if (result) {
+                        result += ",\n    ";
+                    }
+                    else {
+                        result = "[\n    ";
+                    }
+                    result += JSON.stringify(part);
+                }); 
+                if (result) {
+                    result += "\n]";
+                }
+
+                return result;
             }
 
             var actualQuickInfo = this.languageService.getQuickInfoAtPosition(this.activeFile.fileName, this.currentCaretPosition);
             assert.equal(actualQuickInfo.kind, kind, this.messageAtLastKnownMarker("QuickInfo kind"));
             assert.equal(actualQuickInfo.kindModifiers, kindModifiers, this.messageAtLastKnownMarker("QuickInfo kindModifiers"));
-            assert.equal(getJsonString(actualQuickInfo.textSpan), getJsonString(textSpan), this.messageAtLastKnownMarker("QuickInfo textSpan"));
-            assert.equal(getJsonString(actualQuickInfo.displayParts), getJsonString(displayParts), this.messageAtLastKnownMarker("QuickInfo displayParts"));
-            assert.equal(getJsonString(actualQuickInfo.documentation), getJsonString(documentation), this.messageAtLastKnownMarker("QuickInfo documentation"));
+            assert.equal(JSON.stringify(actualQuickInfo.textSpan), JSON.stringify(textSpan), this.messageAtLastKnownMarker("QuickInfo textSpan"));
+            assert.equal(getDisplayPartsJson(actualQuickInfo.displayParts), getDisplayPartsJson(displayParts), this.messageAtLastKnownMarker("QuickInfo displayParts"));
+            assert.equal(getDisplayPartsJson(actualQuickInfo.documentation), getDisplayPartsJson(documentation), this.messageAtLastKnownMarker("QuickInfo documentation"));
         }
 
         public verifyRenameLocations(findInStrings: boolean, findInComments: boolean) {
diff --git a/tests/cases/fourslash/quickInfoDisplayPartsTypeParameterInInterface.ts b/tests/cases/fourslash/quickInfoDisplayPartsTypeParameterInInterface.ts
new file mode 100644
index 00000000000..95797166ea2
--- /dev/null
+++ b/tests/cases/fourslash/quickInfoDisplayPartsTypeParameterInInterface.ts
@@ -0,0 +1,263 @@
+/// <reference path='fourslash.ts'/>
+
+////interface /*1*/I</*2*/T> {
+////    new </*3*/U>(/*4*/a: /*5*/U, /*6*/b: /*7*/T): /*8*/U;
+////    </*9*/U>(/*10*/a: /*11*/U, /*12*/b: /*13*/T): /*14*/U;
+////    /*15*/method</*16*/U>(/*17*/a: /*18*/U, /*19*/b: /*20*/T): /*21*/U;
+////}
+////var /*22*/iVal: /*23*/I<string>;
+////new /*24*/iVal("hello", "hello");
+/////*25*/iVal("hello", "hello");
+/////*26*/iVal./*27*/method("hello", "hello");
+////interface /*28*/I1</*29*/T extends /*30*/I<string>> {
+////    new </*31*/U extends /*32*/I<string>>(/*33*/a: /*34*/U, /*35*/b: /*36*/T): /*37*/U;
+////    </*38*/U extends /*39*/I<string>>(/*40*/a: /*41*/U, /*42*/b: /*43*/T): /*44*/U;
+////    /*45*/method</*46*/U extends /*47*/I<string>>(/*48*/a: /*49*/U, /*50*/b: /*51*/T): /*52*/U;
+////}
+////var /*53*/iVal1: /*54*/I1</*55*/I<string>>;
+////new /*56*/iVal1(/*57*/iVal, /*58*/iVal);
+/////*59*/iVal1(/*60*/iVal, /*61*/iVal);
+/////*62*/iVal1./*63*/method(/*64*/iVal, /*65*/iVal);
+
+var marker = 0;
+var markerName: string;
+
+function goToMarker() {
+    marker++;
+    markerName = marker.toString();
+    goTo.marker(markerName);
+}
+
+function getTypeParameterDisplay(instanceType: ts.SymbolDisplayPart[],
+    name: string, optionalExtends?: ts.SymbolDisplayPart[]) {
+    return instanceType ||
+        function () {
+            var typeParameterDisplay = [{ text: name, kind: "typeParameterName" }];
+            if (optionalExtends) {
+                typeParameterDisplay.push({ text: " ", kind: "space" }, { text: "extends", kind: "keyword" },
+                    { text: " ", kind: "space" });
+                typeParameterDisplay = typeParameterDisplay.concat(optionalExtends);
+            }
+            return typeParameterDisplay
+        } ();
+}
+
+function getInterfaceDisplay(name: string, optionalInstanceType?: ts.SymbolDisplayPart[],
+    optionalExtends?: ts.SymbolDisplayPart[]) {
+    var interfaceDisplay = [{ text: name, kind: "interfaceName" }, { text: "<", kind: "punctuation" }];
+    interfaceDisplay = interfaceDisplay.concat(getTypeParameterDisplay(optionalInstanceType, "T", optionalExtends));
+    interfaceDisplay.push({ text: ">", kind: "punctuation" });
+    return interfaceDisplay;
+}
+
+function verifyInterfaceDisplay(name: string, optionalExtends?: ts.SymbolDisplayPart[]) {
+    goToMarker();
+
+    verify.verifyQuickInfoDisplayParts("interface", "", { start: test.markerByName(markerName).position, length: name.length },
+        [{ text: "interface", kind: "keyword" }, { text: " ", kind: "space" }].concat(
+            getInterfaceDisplay(name, undefined, optionalExtends)), []);
+}
+
+function verifyTypeParameter(name: string, inDisplay: ts.SymbolDisplayPart[]) {
+    goToMarker();
+
+    var typeParameterDisplay = [{ text: "(", kind: "punctuation" }, { text: "type parameter", kind: "text" }, { text: ")", kind: "punctuation" },
+        { text: " ", kind: "space" }, { text: name, kind: "typeParameterName" },
+        { text: " ", kind: "space" }, { text: "in", kind: "keyword" }, { text: " ", kind: "space" }];
+    typeParameterDisplay = typeParameterDisplay.concat(inDisplay);
+
+    verify.verifyQuickInfoDisplayParts("type parameter", "", { start: test.markerByName(markerName).position, length: name.length },
+        typeParameterDisplay, []);
+}
+
+function verifyParameter(name: string, typeParameterName: string, optionalExtends?: ts.SymbolDisplayPart[]) {
+    goToMarker();
+    var parameterDisplay = [{ text: "(", kind: "punctuation" }, { text: "parameter", kind: "text" }, { text: ")", kind: "punctuation" },
+        { text: " ", kind: "space" }, { text: name, kind: "parameterName" }, { text: ":", kind: "punctuation" },
+        { text: " ", kind: "space" }, { text: typeParameterName, kind: "typeParameterName" }];
+    if (optionalExtends) {
+        parameterDisplay.push({ text: " ", kind: "space" }, { text: "extends", kind: "keyword" },
+            { text: " ", kind: "space" });
+        parameterDisplay = parameterDisplay.concat(optionalExtends);
+    }
+    verify.verifyQuickInfoDisplayParts("parameter", "", { start: test.markerByName(markerName).position, length: name.length },
+        parameterDisplay, []);
+}
+
+function getSignatureDisplay(isArrow: boolean, optionalInstanceType?: ts.SymbolDisplayPart[],
+    optionalExtends?: ts.SymbolDisplayPart[]) {
+    var functionDisplay: ts.SymbolDisplayPart[] = [];
+
+    functionDisplay.push({ text: "<", kind: "punctuation" });
+
+    functionDisplay = functionDisplay.concat(
+        getTypeParameterDisplay(optionalInstanceType, "U", optionalExtends));
+
+    functionDisplay.push({ text: ">", kind: "punctuation" }, { text: "(", kind: "punctuation" },
+        { text: "a", kind: "parameterName" }, { text: ":", kind: "punctuation" },
+        { text: " ", kind: "space" });
+    functionDisplay = functionDisplay.concat(
+        getTypeParameterDisplay(optionalInstanceType, "U"));
+    functionDisplay.push({ text: ",", kind: "punctuation" },
+        { text: " ", kind: "space" }, { text: "b", kind: "parameterName" },
+        { text: ":", kind: "punctuation" }, { text: " ", kind: "space" });
+    functionDisplay = functionDisplay.concat(
+        getTypeParameterDisplay(optionalInstanceType, "T"));
+
+    functionDisplay.push({ text: ")", kind: "punctuation" });
+    if (isArrow) {
+        functionDisplay.push({ text: " ", kind: "space" }, { text: "=>", kind: "punctuation" });
+    }
+    else {
+        functionDisplay.push({ text: ":", kind: "punctuation" });
+    }
+    functionDisplay.push({ text: " ", kind: "space" });
+
+    functionDisplay = functionDisplay.concat(
+        getTypeParameterDisplay(optionalInstanceType, "U"));
+
+    return functionDisplay;
+}
+
+function getMethodDisplay(name: string, interfaceName: string, optionalInstanceType?: ts.SymbolDisplayPart[],
+    optionalExtends?: ts.SymbolDisplayPart[]) {
+    return getInterfaceDisplay(interfaceName, optionalInstanceType, optionalExtends).concat(
+        { text: ".", kind: "punctuation" }, { text: name, kind: "methodName" }).concat(
+        getSignatureDisplay(/*isArrow*/ false, optionalInstanceType, optionalExtends));
+}
+
+function getCallOrNewSignatureDisplay(isNew: boolean, isArrow: boolean, interfaceName?: string,
+    optionalInstanceType?: ts.SymbolDisplayPart[], optionalExtends?: ts.SymbolDisplayPart[]) {
+    var result: ts.SymbolDisplayPart[] = [];
+    if (isNew) {
+        result.push({ text: "new", kind: "keyword" }, { text: " ", kind: "space" });
+    }
+    if (interfaceName) {
+        result.push({ text: interfaceName, kind: "interfaceName" });
+    }
+
+    return result.concat(getSignatureDisplay(isArrow, optionalInstanceType, optionalExtends));
+}
+
+function verifyMethodDisplay(name: string, interfaceName: string,
+    optionalInstanceType?: ts.SymbolDisplayPart[], optionalExtends?: ts.SymbolDisplayPart[]) {
+    goToMarker();
+    var functionDisplay = [{ text: "(", kind: "punctuation" }, { text: "method", kind: "text" },
+        { text: ")", kind: "punctuation" }, { text: " ", kind: "space" }].concat(
+        getMethodDisplay(name, interfaceName, optionalInstanceType, optionalExtends));
+
+    verify.verifyQuickInfoDisplayParts("method", "",
+        { start: test.markerByName(markerName).position, length: name.length },
+        functionDisplay, []);
+}
+
+function verifyInterfaceVar(name: string, typeDisplay: ts.SymbolDisplayPart[]) {
+    goToMarker();
+    verify.verifyQuickInfoDisplayParts("var", "", { start: test.markerByName(markerName).position, length: name.length },
+        [{ text: "(", kind: "punctuation" }, { text: "var", kind: "text" }, { text: ")", kind: "punctuation" },
+            { text: " ", kind: "space" }, { text: name, kind: "localName" }, { text: ":", kind: "punctuation" },
+            { text: " ", kind: "space" }].concat(typeDisplay),
+        []);
+}
+
+var stringTypeDisplay = [{ text: "string", kind: "keyword" }];
+var extendsTypeDisplay = getInterfaceDisplay("I", stringTypeDisplay);
+
+
+// Declaration
+verifyInterfaceDisplay("I");
+verifyTypeParameter("T", getInterfaceDisplay("I"));
+
+// New declaration
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ true, /*isArrow*/ false));
+verifyParameter("a", "U");
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ true, /*isArrow*/ false));
+verifyParameter("b", "T");
+verifyTypeParameter("T", getInterfaceDisplay("I"));
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ true, /*isArrow*/ false));
+
+// Call declaration
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ false, /*isArrow*/ false));
+verifyParameter("a", "U");
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ false, /*isArrow*/ false));
+verifyParameter("b", "T");
+verifyTypeParameter("T", getInterfaceDisplay("I"));
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ false, /*isArrow*/ false));
+
+// Method declaration
+verifyMethodDisplay("method", "I");
+verifyTypeParameter("U", getMethodDisplay("method", "I"));
+verifyParameter("a", "U");
+verifyTypeParameter("U", getMethodDisplay("method", "I"));
+verifyParameter("b", "T");
+verifyTypeParameter("T", getInterfaceDisplay("I"));
+verifyTypeParameter("U", getMethodDisplay("method", "I"));
+
+// Instance
+verifyInterfaceVar("iVal", getInterfaceDisplay("I", stringTypeDisplay));
+verifyInterfaceDisplay("I");
+
+// new 
+verifyInterfaceVar("iVal", getCallOrNewSignatureDisplay(/*isNew*/ true, /*isArrow*/ true, "I", stringTypeDisplay));
+
+// call 
+verifyInterfaceVar("iVal", getCallOrNewSignatureDisplay(/*isNew*/ false, /*isArrow*/ true, "I", stringTypeDisplay));
+
+// Method call
+verifyInterfaceVar("iVal", getInterfaceDisplay("I", stringTypeDisplay));
+verifyMethodDisplay("method", "I", stringTypeDisplay);
+
+// With constraint
+// Declaration
+verifyInterfaceDisplay("I1", extendsTypeDisplay);
+verifyTypeParameter("T", getInterfaceDisplay("I1", /*instance*/undefined, extendsTypeDisplay));
+verifyInterfaceDisplay("I");
+
+// New declaration
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ true, /*isArrow*/ false, /*interfaceName*/undefined, /*instance*/undefined, extendsTypeDisplay));
+verifyInterfaceDisplay("I");
+verifyParameter("a", "U", extendsTypeDisplay);
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ true, /*isArrow*/ false, /*interfaceName*/undefined, /*instance*/undefined, extendsTypeDisplay));
+verifyParameter("b", "T", extendsTypeDisplay);
+verifyTypeParameter("T", getInterfaceDisplay("I1", /*instance*/undefined, extendsTypeDisplay));
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ true, /*isArrow*/ false, /*interfaceName*/undefined, /*instance*/undefined, extendsTypeDisplay));
+
+// Call declaration
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ false, /*isArrow*/ false, /*interfaceName*/undefined, /*instance*/undefined, extendsTypeDisplay));
+verifyInterfaceDisplay("I");
+verifyParameter("a", "U", extendsTypeDisplay);
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ false, /*isArrow*/ false, /*interfaceName*/undefined, /*instance*/undefined, extendsTypeDisplay));
+verifyParameter("b", "T", extendsTypeDisplay);
+verifyTypeParameter("T", getInterfaceDisplay("I1", /*instance*/undefined, extendsTypeDisplay));
+verifyTypeParameter("U", getCallOrNewSignatureDisplay(/*isNew*/ false, /*isArrow*/ false, /*interfaceName*/undefined, /*instance*/undefined, extendsTypeDisplay));
+
+// Method declaration
+verifyMethodDisplay("method", "I1", /*instance*/ undefined, extendsTypeDisplay);
+verifyTypeParameter("U", getMethodDisplay("method", "I1", /*instance*/ undefined, extendsTypeDisplay));
+verifyInterfaceDisplay("I");
+verifyParameter("a", "U", extendsTypeDisplay);
+verifyTypeParameter("U", getMethodDisplay("method", "I1", /*instance*/ undefined, extendsTypeDisplay));
+verifyParameter("b", "T", extendsTypeDisplay);
+verifyTypeParameter("T", getInterfaceDisplay("I1", /*instance*/undefined, extendsTypeDisplay));
+verifyTypeParameter("U", getMethodDisplay("method", "I1", /*instance*/ undefined, extendsTypeDisplay));
+
+// Instance
+verifyInterfaceVar("iVal1", getInterfaceDisplay("I1", extendsTypeDisplay));
+verifyInterfaceDisplay("I1", extendsTypeDisplay);
+verifyInterfaceDisplay("I");
+
+// new 
+verifyInterfaceVar("iVal1", getCallOrNewSignatureDisplay(/*isNew*/ true, /*isArrow*/ true, "I1", extendsTypeDisplay));
+verifyInterfaceVar("iVal", getInterfaceDisplay("I", stringTypeDisplay));
+verifyInterfaceVar("iVal", getInterfaceDisplay("I", stringTypeDisplay));
+
+// call 
+verifyInterfaceVar("iVal1", getCallOrNewSignatureDisplay(/*isNew*/ false, /*isArrow*/ true, "I1", extendsTypeDisplay));
+verifyInterfaceVar("iVal", getInterfaceDisplay("I", stringTypeDisplay));
+verifyInterfaceVar("iVal", getInterfaceDisplay("I", stringTypeDisplay));
+
+// Method call
+verifyInterfaceVar("iVal1", getInterfaceDisplay("I1", extendsTypeDisplay));
+verifyMethodDisplay("method", "I1", extendsTypeDisplay);
+verifyInterfaceVar("iVal", getInterfaceDisplay("I", stringTypeDisplay));
+verifyInterfaceVar("iVal", getInterfaceDisplay("I", stringTypeDisplay));