Index: lib/Index/IndexBody.cpp
===================================================================
--- lib/Index/IndexBody.cpp
+++ lib/Index/IndexBody.cpp
@@ -454,6 +454,11 @@
     }
     return true;
   }
+
+  bool VisitLambdaExpr(const LambdaExpr *E) {
+    IndexCtx.indexTagDecl(E->getLambdaClass());
+    return true;
+  }
 };
 
 } // anonymous namespace
Index: test/Index/cxx11-lambdas.cpp
===================================================================
--- test/Index/cxx11-lambdas.cpp
+++ test/Index/cxx11-lambdas.cpp
@@ -31,3 +31,4 @@
 // CHECK-INDEX: [indexEntityReference]: kind: variable | name: localA | USR: c:cxx11-lambdas.cpp@100@S@X@F@f#@localA | lang: C | cursor: DeclRefExpr=localA:6:9 | loc: 8:14
 // CHECK-INDEX: [indexEntityReference]: kind: variable | name: localB | USR: c:cxx11-lambdas.cpp@100@S@X@F@f#@localB | lang: C | cursor: DeclRefExpr=localB:6:17 | loc: 8:23
 // CHECK-INDEX: [indexEntityReference]: kind: variable | name: x | USR: c:cxx11-lambdas.cpp@157@S@X@F@f#@Sa@F@operator()#I#1@x | lang: C | cursor: DeclRefExpr=x:7:46 | loc: 8:32
+// CHECK-INDEX: [indexDeclaration]: kind: variable | name: x | USR: c:cxx11-lambdas.cpp@157@S@X@F@f#@Sa@F@operator()#I#1@x | lang: C | cursor: ParmDecl=x:7:46 (Definition) | loc: 7:46
\ No newline at end of file