Run fixupParentReferences when parsing isolated jsDocComment

src/compiler/parser.ts

@@ -440,7 +440,14 @@ namespace ts {
 
     /* @internal */
     export function parseIsolatedJSDocComment(content: string, start?: number, length?: number) {
-        return Parser.JSDocParser.parseIsolatedJSDocComment(content, start, length);
+        const result = Parser.JSDocParser.parseIsolatedJSDocComment(content, start, length);
+        if (result && result.jsDocComment) {
+            // because the jsDocComment was parsed out of the source file, it might
+            // not be covered by the fixupParentReferences.
+            Parser.fixupParentReferences(result.jsDocComment);
+        }
+
+        return result;
     }
 
     /* @internal */
@@ -652,14 +659,14 @@ namespace ts {
             return node;
         }
 
-        export function fixupParentReferences(sourceFile: Node) {
+        export function fixupParentReferences(rootNode: Node) {
             // normally parent references are set during binding. However, for clients that only need
             // a syntax tree, and no semantic features, then the binding process is an unnecessary
             // overhead.  This functions allows us to set all the parents, without all the expense of
             // binding.
 
-            let parent: Node = sourceFile;
-            forEachChild(sourceFile, visitNode);
+            let parent: Node = rootNode;
+            forEachChild(rootNode, visitNode);
             return;
 
             function visitNode(n: Node): void {

tests/cases/fourslash/syntacticClassificationForJSDocTemplateTag.ts

@@ -0,0 +1,22 @@
+/// <reference path="fourslash.ts"/>
+
+/////** @template T */
+////function ident<T>: T {
+////}
+
+var c = classification;
+verify.syntacticClassificationsAre(
+    c.comment("/** "),
+    c.punctuation("@"),
+    c.docCommentTagName("template"),
+    c.typeParameterName("T"),
+    c.comment(" */"),
+    c.keyword("function"),
+    c.identifier("ident"),
+    c.punctuation("<"),
+    c.typeParameterName("T"),
+    c.punctuation(">"),
+    c.punctuation(":"),
+    c.identifier("T"),
+    c.punctuation("{"),
+    c.punctuation("}"));