Index: include/clang/Parse/Parser.h
===================================================================
--- include/clang/Parse/Parser.h
+++ include/clang/Parse/Parser.h
@@ -214,6 +214,10 @@
   /// should not be set directly.
   bool InMessageExpression;
 
+  /// Gets set to true after calling CodeCompleteCall, it is for a workaround to
+  /// make sure CodeComleteCall is only called at the deepest level.
+  bool CalledOverloadCompletion = false;
+
   /// The "depth" of the template parameters currently being parsed.
   unsigned TemplateParameterDepth;
 
Index: lib/Parse/ParseExpr.cpp
===================================================================
--- lib/Parse/ParseExpr.cpp
+++ lib/Parse/ParseExpr.cpp
@@ -1658,11 +1658,21 @@
 
       if (OpKind == tok::l_paren || !LHS.isInvalid()) {
         if (Tok.isNot(tok::r_paren)) {
-          if (ParseExpressionList(ArgExprs, CommaLocs, [&] {
-                Actions.CodeCompleteCall(getCurScope(), LHS.get(), ArgExprs,
-                                         PT.getOpenLocation());
-              })) {
+          auto Completer = [&] {
+            if (CalledOverloadCompletion)
+              return;
+            Actions.CodeCompleteCall(getCurScope(), LHS.get(), ArgExprs,
+                                     PT.getOpenLocation());
+            CalledOverloadCompletion = true;
+          };
+          if (ParseExpressionList(ArgExprs, CommaLocs, Completer)) {
             (void)Actions.CorrectDelayedTyposInExpr(LHS);
+            // If we got an error when parsing expression list, we don't call
+            // the CodeCompleteCall handler inside the parser. So call it here
+            // to make sure we get overload suggestions even when we are in the
+            // middle of a parameter.
+            if (PP.isCodeCompletionReached())
+              Completer();
             LHS = ExprError();
           } else if (LHS.isInvalid()) {
             for (auto &E : ArgExprs)
Index: test/CodeCompletion/function-overloads-inside-param.cpp
===================================================================
--- /dev/null
+++ test/CodeCompletion/function-overloads-inside-param.cpp
@@ -0,0 +1,8 @@
+void f(int i, int j = 2, int k = 5);
+void f(float x, float y...);
+
+void test() {
+  ::f(1
+  // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:5:8 %s -o - | FileCheck -check-prefix=CHECK-CC1 %s
+  // CHECK-CC1: f(<#int i#>{#, <#int j = 2#>{#, <#int k = 5#>#}#})
+  // CHECK-CC1: f(<#float x#>, <#float y, ...#>)
Index: test/CodeCompletion/function-overloads.cpp
===================================================================
--- /dev/null
+++ test/CodeCompletion/function-overloads.cpp
@@ -0,0 +1,8 @@
+void f(int i, int j = 2, int k = 5);
+void f(float x, float y...);
+
+void test() {
+  ::f(
+  // RUN: %clang_cc1 -fsyntax-only -code-completion-at=%s:5:7 %s -o - | FileCheck -check-prefix=CHECK-CC1 %s
+  // CHECK-CC1: f(<#int i#>{#, <#int j = 2#>{#, <#int k = 5#>#}#})
+  // CHECK-CC1: f(<#float x#>, <#float y, ...#>)
Index: test/Index/complete-block-property-assignment.m
===================================================================
--- test/Index/complete-block-property-assignment.m
+++ test/Index/complete-block-property-assignment.m
@@ -60,7 +60,6 @@
 // RUN: c-index-test -code-completion-at=%s:51:16 %s | FileCheck -check-prefix=CHECK-NO %s
 // RUN: c-index-test -code-completion-at=%s:52:23 %s | FileCheck -check-prefix=CHECK-NO %s
 // RUN: c-index-test -code-completion-at=%s:53:12 %s | FileCheck -check-prefix=CHECK-NO %s
-// RUN: c-index-test -code-completion-at=%s:54:15 %s | FileCheck -check-prefix=CHECK-NO %s
 // RUN: c-index-test -code-completion-at=%s:56:15 %s | FileCheck -check-prefix=CHECK-NO %s
 // CHECK-NO: ObjCPropertyDecl:{ResultType int}{TypedText foo} (35)
 // CHECK-NO-NEXT: ObjCPropertyDecl:{ResultType Obj *}{TypedText obj} (35)
@@ -69,4 +68,7 @@
 // CHECK-NO-NEXT: ObjCPropertyDecl:{ResultType void (^)(int *)}{TypedText onReadonly} (35)
 // CHECK-NO-NEXT: ObjCPropertyDecl:{ResultType int (^)(int)}{TypedText processEvent} (35)
 
+// RUN: c-index-test -code-completion-at=%s:54:15 %s | FileCheck -check-prefix=CHECK-NO1 %s
+// CHECK-NO1: ObjCPropertyDecl:{ResultType int}{TypedText foo} (35)
+// CHECK-NO1-NEXT: FunctionDecl:{ResultType void}{TypedText func}{LeftParen (}{Placeholder int x}{RightParen )} (50)
 @end