diff --git a/_examples/structs/structs.go b/_examples/structs/structs.go
index 7683f2f..a2d4516 100644
--- a/_examples/structs/structs.go
+++ b/_examples/structs/structs.go
@@ -27,3 +27,10 @@ type S2 struct {
 	Public  int
 	private int
 }
+
+type Dim int
+
+type S3 struct {
+	X Dim
+	Y Dim
+}
diff --git a/_examples/structs/test.py b/_examples/structs/test.py
index f744df9..b9caf1a 100644
--- a/_examples/structs/test.py
+++ b/_examples/structs/test.py
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-## py2/py3 compat
+# py2/py3 compat
 from __future__ import print_function
 
 import structs
@@ -16,7 +16,7 @@ print("s.Upper('boo')= %s" % repr(s.Upper("boo")).lstrip('u'))
 
 print("s1 = structs.S1()")
 s1 = structs.S1()
-print("s1 = %s" %(s1,))
+print("s1 = %s" % (s1,))
 
 try:
     s1 = structs.S1(1)
@@ -31,17 +31,17 @@ except Exception as err:
     print("caught error: %s" % (err,))
     pass
 
- 
+
 print("s2 = structs.S2()")
 s2 = structs.S2(1)
 print("s2 = %s" % (s2,))
 
 try:
-    s2 = structs.S2(1,2)
+    s2 = structs.S2(1, 2)
 except Exception as err:
     print("caught error: %s" % (err,))
     pass
- 
+
 try:
     s2 = structs.S2(42)
     print("s2 = %s" % (s2,))
@@ -51,14 +51,17 @@ except Exception as err:
     print("caught error: %s" % (err,))
     pass
 
+
 class S2Child(structs.S2):
     def __init__(self, a, b):
         super(S2Child, self).__init__(a)
         self.local = b
+
     def __str__(self):
         return ("S2Child{S2: %s, local: %d}"
                 % (super(S2Child, self).__str__(), self.local))
 
+
 try:
     s2child = S2Child(42, 123)
     print("s2child = %s" % (s2child,))
@@ -69,4 +72,13 @@ except Exception as err:
     print("caught error: %s" % (err,))
     pass
 
+try:
+    val = structs.S3()
+    val.X = 3
+    val.Y = 4
+    print("s3.X,Y = %d,%d" % (val.X, val.Y))
+except Exception as err:
+    print("caught error: %s" % (err,))
+    pass
+
 print("OK")
diff --git a/bind/gen_struct.go b/bind/gen_struct.go
index b971d26..f8c2611 100644
--- a/bind/gen_struct.go
+++ b/bind/gen_struct.go
@@ -299,6 +299,7 @@ func (g *pyGen) genIfaceInit(ifc *Interface) {
 handle=A Go-side object is always initialized with an explicit handle=arg
 """
 `)
+
 	g.pywrap.Printf("if len(kwargs) == 1 and 'handle' in kwargs:\n")
 	g.pywrap.Indent()
 	g.pywrap.Printf("self.handle = kwargs['handle']\n")
diff --git a/go.mod b/go.mod
index 5d90f6e..1c89f34 100644
--- a/go.mod
+++ b/go.mod
@@ -6,5 +6,5 @@ require (
 	github.com/gonuts/commander v0.1.0
 	github.com/gonuts/flag v0.1.0
 	github.com/pkg/errors v0.8.1
-	golang.org/x/tools v0.0.0-20190823170909-c4a336ef6a2f
+	golang.org/x/tools v0.0.0-20200326194725-b1df9901287c
 )
diff --git a/go.sum b/go.sum
index 1f8f6bd..426ed3c 100644
--- a/go.sum
+++ b/go.sum
@@ -4,11 +4,23 @@ github.com/gonuts/flag v0.1.0 h1:fqMv/MZ+oNGu0i9gp0/IQ/ZaPIDoAZBOBaJoV7viCWM=
 github.com/gonuts/flag v0.1.0/go.mod h1:ZTmTGtrSPejTo/SRNhCqwLTmiAgyBdCkLYhHrAoBdz4=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20190823170909-c4a336ef6a2f h1:ESK9Jb5JOE+y4u+ozMQeXfMHwEHm6zVbaDQkeaj6wI4=
 golang.org/x/tools v0.0.0-20190823170909-c4a336ef6a2f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20200326194725-b1df9901287c h1:lOHr9KzDy5SxEmffvQO+sLmartg6RfDELX60/tv3qFg=
+golang.org/x/tools v0.0.0-20200326194725-b1df9901287c/go.mod h1:Sl4aGygMT6LrqrWclx+PTx3U+LnKx/seiNR+3G19Ar8=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/main_test.go b/main_test.go
index ceb6046..5527bb9 100644
--- a/main_test.go
+++ b/main_test.go
@@ -390,6 +390,7 @@ s2child = S2Child{S2: structs.S2{Public=42, handle=8, local=123}, local: 123}
 s2child.Public = 42
 s2child.local = 123
 caught error: 'S2Child' object has no attribute 'private'
+s3.X,Y = 3,4
 OK
 `),
 	})