gopherjs
diff --git a/‎compiler/gopherjspkg/fs_vfsdata.go
Lines changed: 3 additions & 3 deletions b/‎compiler/gopherjspkg/fs_vfsdata.go
Lines changed: 3 additions & 3 deletions
diff --git a/‎compiler/natives/fs_vfsdata.go
Lines changed: 1 addition & 1 deletion b/‎compiler/natives/fs_vfsdata.go
Lines changed: 1 addition & 1 deletion
diff --git a/‎compiler/prelude/jsmapping.js
Lines changed: 3 additions & 0 deletions b/‎compiler/prelude/jsmapping.js
Lines changed: 3 additions & 0 deletions
diff --git a/‎compiler/prelude/prelude.go
Lines changed: 1 addition & 1 deletion b/‎compiler/prelude/prelude.go
Lines changed: 1 addition & 1 deletion
diff --git a/‎compiler/prelude/prelude_min.go
Lines changed: 1 addition & 1 deletion b/‎compiler/prelude/prelude_min.go
Lines changed: 1 addition & 1 deletion
diff --git a/‎tests/js_test.go
Lines changed: 8 additions & 0 deletions b/‎tests/js_test.go
Lines changed: 8 additions & 0 deletions
@@ -392,6 +392,9 @@ var $isASCII = function(s) {
 };
 
 var $copyIfRequired = function(v, typ) {
+  if (v == undefined) {
+    return v;
+  }
   // interface values
   if (v.constructor.copy) {
     return new v.constructor($clone(v.$val, v.constructor));
 
@@ -468,6 +468,11 @@ func (m M) NonPointField() string {
 	return "sensible"
 }
 
+func (m *M) IncF() {
+	// no return value
+	m.f++
+}
+
 func TestMakeWrapper(t *testing.T) {
 	m := &M{f: 42}
 	if !js.Global.Call("eval", `(function(m) { return m.Method({x: 1})["y"] === "z"; })`).Invoke(js.MakeWrapper(m)).Bool() {
@@ -478,6 +483,9 @@ func TestMakeWrapper(t *testing.T) {
 		t.Fail()
 	}
 
+	if !js.Global.Call("eval", `(function(m) { return m.IncF() === undefined })`).Invoke(js.MakeWrapper(m)).Bool() {
+		t.Fail()
+	}
 }
 
 func TestMakeFullWrapperType(t *testing.T) {
Original file line number	Diff line number	Diff line change
`@@ -468,6 +468,11 @@ func (m M) NonPointField() string {`
`468`	`468`	`return "sensible"`
`469`	`469`	`}`
`470`	`470`
	`471`	`+func (m *M) IncF() {`
	`472`	`+ // no return value`
	`473`	`+ m.f++`
	`474`	`+}`
	`475`	`+`
`471`	`476`	`func TestMakeWrapper(t *testing.T) {`
`472`	`477`	`m := &M{f: 42}`
`473`	`478`	if !js.Global.Call("eval", `(function(m) { return m.Method({x: 1})["y"] === "z"; })`).Invoke(js.MakeWrapper(m)).Bool() {
`@@ -478,6 +483,9 @@ func TestMakeWrapper(t *testing.T) {`
`478`	`483`	`t.Fail()`
`479`	`484`	`}`
`480`	`485`
	`486`	+ if !js.Global.Call("eval", `(function(m) { return m.IncF() === undefined })`).Invoke(js.MakeWrapper(m)).Bool() {
	`487`	`+ t.Fail()`
	`488`	`+ }`
`481`	`489`	`}`
`482`	`490`
`483`	`491`	`func TestMakeFullWrapperType(t *testing.T) {`