Index: include/clang/Sema/Sema.h
===================================================================
--- include/clang/Sema/Sema.h
+++ include/clang/Sema/Sema.h
@@ -10795,6 +10795,9 @@
   Decl *D;
 };
 
+ValueDecl *tryGetMember(CXXRecordDecl *ClassDecl, CXXScopeSpec &SS,
+                        ParsedType TemplateTypeTy,
+                        IdentifierInfo *MemberOrBase);
 } // end namespace clang
 
 namespace llvm {
Index: lib/Parse/ParseDeclCXX.cpp
===================================================================
--- lib/Parse/ParseDeclCXX.cpp
+++ lib/Parse/ParseDeclCXX.cpp
@@ -3449,6 +3449,7 @@
   if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
     Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
 
+    // FIXME: Add support for signature help inside initializer lists.
     ExprResult InitList = ParseBraceInitializer();
     if (InitList.isInvalid())
       return true;
@@ -3466,7 +3467,26 @@
     // Parse the optional expression-list.
     ExprVector ArgExprs;
     CommaLocsTy CommaLocs;
-    if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
+    auto SignatureHelpCaller = [&] {
+      if (CalledSignatureHelp)
+        return;
+      CXXConstructorDecl *Constructor =
+          dyn_cast<CXXConstructorDecl>(ConstructorDecl);
+      if (!Constructor)
+        return;
+      // FIXME: Add support for Base class constructors as well.
+      if (ValueDecl *MemberDecl =
+              tryGetMember(Constructor->getParent(), SS, TemplateTypeTy, II)) {
+        Actions.ProduceConstructorSignatureHelp(
+            getCurScope(), MemberDecl->getType(), MemberDecl->getLocation(),
+            ArgExprs, T.getOpenLocation());
+        CalledSignatureHelp = true;
+      }
+    };
+    if (Tok.isNot(tok::r_paren) &&
+        ParseExpressionList(ArgExprs, CommaLocs, SignatureHelpCaller)) {
+      if (PP.isCodeCompletionReached())
+        SignatureHelpCaller();
       SkipUntil(tok::r_paren, StopAtSemi);
       return true;
     }
Index: lib/Sema/SemaDeclCXX.cpp
===================================================================
--- lib/Sema/SemaDeclCXX.cpp
+++ lib/Sema/SemaDeclCXX.cpp
@@ -3777,6 +3777,23 @@
 
 }
 
+ValueDecl *clang::tryGetMember(CXXRecordDecl *ClassDecl, CXXScopeSpec &SS,
+                        ParsedType TemplateTypeTy,
+                        IdentifierInfo *MemberOrBase) {
+  if (!SS.getScopeRep() && !TemplateTypeTy) {
+    // Look for a member, first.
+    DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase);
+    if (!Result.empty()) {
+      ValueDecl *Member;
+      if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
+          (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) {
+        return Member;
+      }
+    }
+  }
+  return nullptr;
+}
+
 /// Handle a C++ member initializer.
 MemInitResult
 Sema::BuildMemInitializer(Decl *ConstructorD,
@@ -3820,21 +3837,14 @@
   //   of a single identifier refers to the class member. A
   //   mem-initializer-id for the hidden base class may be specified
   //   using a qualified name. ]
-  if (!SS.getScopeRep() && !TemplateTypeTy) {
-    // Look for a member, first.
-    DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase);
-    if (!Result.empty()) {
-      ValueDecl *Member;
-      if ((Member = dyn_cast<FieldDecl>(Result.front())) ||
-          (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) {
-        if (EllipsisLoc.isValid())
-          Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
-            << MemberOrBase
-            << SourceRange(IdLoc, Init->getSourceRange().getEnd());
-
-        return BuildMemberInitializer(Member, Init, IdLoc);
-      }
-    }
+  if (ValueDecl *Member =
+          tryGetMember(ClassDecl, SS, TemplateTypeTy, MemberOrBase)) {
+    if (EllipsisLoc.isValid())
+      Diag(EllipsisLoc, diag::err_pack_expansion_member_init)
+          << MemberOrBase
+          << SourceRange(IdLoc, Init->getSourceRange().getEnd());
+
+    return BuildMemberInitializer(Member, Init, IdLoc);
   }
   // It didn't name a member, so see if it names a class.
   QualType BaseType;
Index: test/CodeCompletion/ctor-initializer.cpp
===================================================================
--- test/CodeCompletion/ctor-initializer.cpp
+++ test/CodeCompletion/ctor-initializer.cpp
@@ -64,3 +64,26 @@
   // CHECK-CC8: COMPLETION: Pattern : member2(<#args#>
   int member1, member2;
 };
+
+struct Base2 {
+  Base2(int);
+};
+
+struct Composition1 {
+  Composition1() : b2_elem() {}
+  // RUN: %clang_cc1 -fsyntax-only -std=c++98 -code-completion-at=%s:73:28 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
+  // RUN: %clang_cc1 -fsyntax-only -std=c++14 -code-completion-at=%s:73:28 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
+  // CHECK-CC9: OVERLOAD: Base2(<#int#>)
+  // CHECK-CC9: OVERLOAD: Base2(<#const Base2 &#>)
+  Composition1(Base2);
+  Base2 b2_elem;
+};
+
+struct Composition2 {
+  Composition2() : c1_elem(Base2(1)) {}
+  // RUN: %clang_cc1 -fsyntax-only -std=c++98 -code-completion-at=%s:83:34 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
+  // RUN: %clang_cc1 -fsyntax-only -std=c++14 -code-completion-at=%s:83:34 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
+  // RUN: %clang_cc1 -fsyntax-only -std=c++98 -code-completion-at=%s:83:35 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
+  // RUN: %clang_cc1 -fsyntax-only -std=c++14 -code-completion-at=%s:83:35 %s -o - | FileCheck -check-prefix=CHECK-CC9 %s
+  Composition1 c1_elem;
+};