diff --git a/test/Interop/Cxx/class/Inputs/module.modulemap b/test/Interop/Cxx/class/Inputs/module.modulemap
index cb61582d4b941..d4460da89db64 100644
--- a/test/Interop/Cxx/class/Inputs/module.modulemap
+++ b/test/Interop/Cxx/class/Inputs/module.modulemap
@@ -21,3 +21,7 @@ module MemberVariables {
 module ProtocolConformance {
   header "protocol-conformance.h"
 }
+
+module SynthesizedInitializers {
+  header "synthesized-initializers.h"
+}
diff --git a/test/Interop/Cxx/class/Inputs/synthesized-initializers.h b/test/Interop/Cxx/class/Inputs/synthesized-initializers.h
new file mode 100644
index 0000000000000..da20bf036bd10
--- /dev/null
+++ b/test/Interop/Cxx/class/Inputs/synthesized-initializers.h
@@ -0,0 +1,5 @@
+struct EmptyStruct {};
+
+struct IntBox {
+  int x;
+};
diff --git a/test/Interop/Cxx/class/synthesized-initializers.swift b/test/Interop/Cxx/class/synthesized-initializers.swift
new file mode 100644
index 0000000000000..ea74f8ab4eecb
--- /dev/null
+++ b/test/Interop/Cxx/class/synthesized-initializers.swift
@@ -0,0 +1,46 @@
+// RUN: %target-swift-frontend -I %S/Inputs -enable-cxx-interop -emit-silgen %s | %FileCheck %s
+
+import SynthesizedInitializers
+
+// CHECK-LABEL: sil shared [transparent] [serializable] [ossa] @$sSo11EmptyStructVABycfC : $@convention(method) (@thin EmptyStruct.Type) -> EmptyStruct
+// CHECK: bb0(%{{[0-9]+}} : $@thin EmptyStruct.Type):
+// CHECK-NEXT: [[BOX:%.*]] = alloc_box ${ var EmptyStruct }
+// CHECK-NEXT: [[UNINIT:%.*]] = mark_uninitialized [rootself] [[BOX]] : ${ var EmptyStruct }
+// CHECK-NEXT: [[PTR:%.*]] = project_box [[UNINIT]] : ${ var EmptyStruct }, 0
+// CHECK-NEXT: [[OBJ:%.*]] = builtin "zeroInitializer"<EmptyStruct>() : $EmptyStruct
+// CHECK-NEXT: [[PA:%.*]] = begin_access [modify] [unknown] [[PTR]] : $*EmptyStruct
+// CHECK-NEXT: assign [[OBJ]] to [[PA]]
+// CHECK-NEXT: end_access [[PA]]
+// CHECK-NEXT: [[OUT:%.*]] = load [trivial] [[PTR]]
+// CHECK-NEXT: destroy_value [[UNINIT]]
+// CHECK-NEXT: return [[OUT]]
+// CHECK-LABEL: end sil function '$sSo11EmptyStructVABycfC'
+public func emptyTypeNoArgInit() {
+  let e = EmptyStruct()
+}
+
+// CHECK-LABEL: sil shared [transparent] [serializable] [ossa] @$sSo6IntBoxVABycfC : $@convention(method) (@thin IntBox.Type) -> IntBox
+// CHECK: bb0(%{{[0-9]+}} : $@thin IntBox.Type):
+// CHECK-NEXT: [[BOX:%.*]] = alloc_box ${ var IntBox }
+// CHECK-NEXT: [[UNINIT:%.*]] = mark_uninitialized [rootself] [[BOX]] : ${ var IntBox }
+// CHECK-NEXT: [[PTR:%.*]] = project_box [[UNINIT]] : ${ var IntBox }, 0
+// CHECK-NEXT: [[OBJ:%.*]] = builtin "zeroInitializer"<IntBox>() : $IntBox
+// CHECK-NEXT: [[PA:%.*]] = begin_access [modify] [unknown] [[PTR]] : $*IntBox
+// CHECK-NEXT: assign [[OBJ]] to [[PA]]
+// CHECK-NEXT: end_access [[PA]]
+// CHECK-NEXT: [[OUT:%.*]] = load [trivial] [[PTR]]
+// CHECK-NEXT: destroy_value [[UNINIT]]
+// CHECK-NEXT: return [[OUT]]
+// CHECK-LABEL: end sil function '$sSo6IntBoxVABycfC'
+public func singleMemberTypeNoArgInit() {
+  let i = IntBox()
+}
+
+// CHECK-LABEL: sil shared [transparent] [serializable] [ossa] @$sSo6IntBoxV1xABs5Int32V_tcfC : $@convention(method) (Int32, @thin IntBox.Type) -> IntBox
+// CHECK: bb0([[I:%[0-9]+]] : $Int32, %{{[0-9]+}} : $@thin IntBox.Type):
+// CHECK-NEXT: [[S:%.*]] = struct $IntBox ([[I]] : $Int32)
+// CHECK-NEXT: return [[S]]
+// CHECK-LABEL: end sil function '$sSo6IntBoxV1xABs5Int32V_tcfC'
+public func singleMemberTypeValueInit() {
+  let i = IntBox(x: 42)
+}