diff --git a/src/compiler/binder.ts b/src/compiler/binder.ts
index 00bf031c18321..448922e5db380 100644
--- a/src/compiler/binder.ts
+++ b/src/compiler/binder.ts
@@ -547,6 +547,7 @@ function createBinder(): (file: SourceFile, options: CompilerOptions) => void {
     var unreachableFlow: FlowNode = { flags: FlowFlags.Unreachable };
     var reportedUnreachableFlow: FlowNode = { flags: FlowFlags.Unreachable };
     var bindBinaryExpressionFlow = createBindBinaryExpressionFlow();
+    var alreadyBound: Set<Node>;
     /* eslint-enable no-var */
 
     return bindSourceFile;
@@ -567,6 +568,7 @@ function createBinder(): (file: SourceFile, options: CompilerOptions) => void {
         inStrictMode = bindInStrictMode(file, opts);
         classifiableNames = new Set();
         symbolCount = 0;
+        alreadyBound = new Set();
 
         Symbol = objectAllocator.getSymbolConstructor();
 
@@ -604,6 +606,7 @@ function createBinder(): (file: SourceFile, options: CompilerOptions) => void {
         hasExplicitReturn = false;
         inAssignmentPattern = false;
         emitFlags = NodeFlags.None;
+        alreadyBound = undefined!;
     }
 
     function bindInStrictMode(file: SourceFile, opts: CompilerOptions): boolean {
@@ -2027,7 +2030,7 @@ function createBinder(): (file: SourceFile, options: CompilerOptions) => void {
     }
 
     function bindJSDocClassTag(node: JSDocClassTag) {
-        bindEachChild(node);
+        // bindEachChild(node);
         const host = getHostSignatureFromJSDoc(node);
         if (host && host.kind !== SyntaxKind.MethodDeclaration) {
             addDeclarationToSymbol(host.symbol, host, SymbolFlags.Class);
@@ -2640,6 +2643,10 @@ function createBinder(): (file: SourceFile, options: CompilerOptions) => void {
         if (!node) {
             return;
         }
+
+        Debug.assert(!alreadyBound.has(node), "This node has already been bound.");
+        alreadyBound.add(node);
+
         setParent(node, parent);
         if (tracing) (node as TracingNode).tracingPath = file.path;
         const saveInStrictMode = inStrictMode;