Index: lib/AST/StmtPrinter.cpp
===================================================================
--- lib/AST/StmtPrinter.cpp
+++ lib/AST/StmtPrinter.cpp
@@ -1895,6 +1895,9 @@
       llvm_unreachable("VLA type in explicit captures.");
     }
 
+    if (C->isPackExpansion())
+      OS << "...";
+
     if (Node->isInitCapture(C))
       PrintExpr(C->getCapturedVar()->getInit());
   }
Index: test/AST/ast-printer-lambda.cpp
===================================================================
--- test/AST/ast-printer-lambda.cpp
+++ test/AST/ast-printer-lambda.cpp
@@ -0,0 +1,36 @@
+// RUN: %clang_cc1 -ast-print -std=c++17 %s | FileCheck %s
+
+struct S {
+template<typename ... T>
+void test1(int i, T... t) {
+{
+  auto lambda = [i]{};
+  //CHECK: [i] {
+}
+{
+  auto lambda = [=]{};
+  //CHECK: [=] {
+}
+{
+  auto lambda = [&]{};
+  //CHECK: [&] {
+}
+{
+  auto lambda = [t..., i]{};
+  //CHECK: [t..., i] {
+}
+{
+  auto lambda = [&t...]{};
+  //CHECK: [&t...] {
+}
+{
+  auto lambda = [this, &t...]{};
+  //CHECK: [this, &t...] {
+}
+{
+  auto lambda = [t..., this]{};
+  //CHECK: [t..., this] {
+}
+}
+
+};
\ No newline at end of file