diff --git a/cl/_testgo/ifaceprom/out.ll b/cl/_testgo/ifaceprom/out.ll
index 35f08aa1..ab5a8118 100644
--- a/cl/_testgo/ifaceprom/out.ll
+++ b/cl/_testgo/ifaceprom/out.ll
@@ -319,7 +319,7 @@ _llgo_17:                                         ; preds = %_llgo_4
   %108 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 16)
   %109 = getelementptr inbounds { %"github.com/goplus/llgo/runtime/internal/runtime.iface" }, ptr %108, i32 0, i32 0
   store %"github.com/goplus/llgo/runtime/internal/runtime.iface" %43, ptr %109, align 8
-  %110 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testgo/ifaceprom.one$bound", ptr undef }, ptr %108, 1
+  %110 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testgo/ifaceprom.I.one$bound", ptr undef }, ptr %108, 1
   %111 = extractvalue { ptr, ptr } %110, 1
   %112 = extractvalue { ptr, ptr } %110, 0
   %113 = call i64 %112(ptr %111)
@@ -339,7 +339,7 @@ _llgo_19:                                         ; preds = %_llgo_6
   %119 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 16)
   %120 = getelementptr inbounds { %"github.com/goplus/llgo/runtime/internal/runtime.iface" }, ptr %119, i32 0, i32 0
   store %"github.com/goplus/llgo/runtime/internal/runtime.iface" %51, ptr %120, align 8
-  %121 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testgo/ifaceprom.one$bound", ptr undef }, ptr %119, 1
+  %121 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testgo/ifaceprom.I.one$bound", ptr undef }, ptr %119, 1
   %122 = extractvalue { ptr, ptr } %121, 1
   %123 = extractvalue { ptr, ptr } %121, 0
   %124 = call i64 %123(ptr %122)
@@ -359,7 +359,7 @@ _llgo_21:                                         ; preds = %_llgo_12
   %130 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 16)
   %131 = getelementptr inbounds { %"github.com/goplus/llgo/runtime/internal/runtime.iface" }, ptr %130, i32 0, i32 0
   store %"github.com/goplus/llgo/runtime/internal/runtime.iface" %93, ptr %131, align 8
-  %132 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testgo/ifaceprom.two$bound", ptr undef }, ptr %130, 1
+  %132 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testgo/ifaceprom.I.two$bound", ptr undef }, ptr %130, 1
   %133 = extractvalue { ptr, ptr } %132, 1
   %134 = extractvalue { ptr, ptr } %132, 0
   %135 = call %"github.com/goplus/llgo/runtime/internal/runtime.String" %134(ptr %133)
@@ -380,7 +380,7 @@ _llgo_23:                                         ; preds = %_llgo_14
   %142 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 16)
   %143 = getelementptr inbounds { %"github.com/goplus/llgo/runtime/internal/runtime.iface" }, ptr %142, i32 0, i32 0
   store %"github.com/goplus/llgo/runtime/internal/runtime.iface" %101, ptr %143, align 8
-  %144 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testgo/ifaceprom.two$bound", ptr undef }, ptr %142, 1
+  %144 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testgo/ifaceprom.I.two$bound", ptr undef }, ptr %142, 1
   %145 = extractvalue { ptr, ptr } %144, 1
   %146 = extractvalue { ptr, ptr } %144, 0
   %147 = call %"github.com/goplus/llgo/runtime/internal/runtime.String" %146(ptr %145)
@@ -585,7 +585,7 @@ declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.NewNamedInterface"
 
 declare void @"github.com/goplus/llgo/runtime/internal/runtime.InitNamedInterface"(ptr, %"github.com/goplus/llgo/runtime/internal/runtime.Slice")
 
-define i64 @"github.com/goplus/llgo/cl/_testgo/ifaceprom.one$bound"(ptr %0) {
+define i64 @"github.com/goplus/llgo/cl/_testgo/ifaceprom.I.one$bound"(ptr %0) {
 _llgo_0:
   %1 = load { %"github.com/goplus/llgo/runtime/internal/runtime.iface" }, ptr %0, align 8
   %2 = extractvalue { %"github.com/goplus/llgo/runtime/internal/runtime.iface" } %1, 0
@@ -603,7 +603,7 @@ _llgo_0:
 
 declare i1 @"github.com/goplus/llgo/runtime/internal/runtime.StringEqual"(%"github.com/goplus/llgo/runtime/internal/runtime.String", %"github.com/goplus/llgo/runtime/internal/runtime.String")
 
-define %"github.com/goplus/llgo/runtime/internal/runtime.String" @"github.com/goplus/llgo/cl/_testgo/ifaceprom.two$bound"(ptr %0) {
+define %"github.com/goplus/llgo/runtime/internal/runtime.String" @"github.com/goplus/llgo/cl/_testgo/ifaceprom.I.two$bound"(ptr %0) {
 _llgo_0:
   %1 = load { %"github.com/goplus/llgo/runtime/internal/runtime.iface" }, ptr %0, align 8
   %2 = extractvalue { %"github.com/goplus/llgo/runtime/internal/runtime.iface" } %1, 0
diff --git a/cl/_testrt/closurebound/in.go b/cl/_testrt/closurebound/in.go
new file mode 100644
index 00000000..32663a34
--- /dev/null
+++ b/cl/_testrt/closurebound/in.go
@@ -0,0 +1,25 @@
+package main
+
+func main() {
+	se := demo1{}
+	f := se.encode
+	if f() != 1 {
+		panic("error")
+	}
+}
+
+var my = demo2{}.encode
+
+type demo1 struct {
+}
+
+func (se demo1) encode() int {
+	return 1
+}
+
+type demo2 struct {
+}
+
+func (se demo2) encode() int {
+	return 2
+}
diff --git a/cl/_testrt/closurebound/out.ll b/cl/_testrt/closurebound/out.ll
new file mode 100644
index 00000000..22cd8dda
--- /dev/null
+++ b/cl/_testrt/closurebound/out.ll
@@ -0,0 +1,117 @@
+; ModuleID = 'github.com/goplus/llgo/cl/_testrt/closurebound'
+source_filename = "github.com/goplus/llgo/cl/_testrt/closurebound"
+
+%"github.com/goplus/llgo/cl/_testrt/closurebound.demo1" = type {}
+%"github.com/goplus/llgo/cl/_testrt/closurebound.demo2" = type {}
+%"github.com/goplus/llgo/runtime/internal/runtime.String" = type { ptr, i64 }
+%"github.com/goplus/llgo/runtime/internal/runtime.eface" = type { ptr, ptr }
+
+@"github.com/goplus/llgo/cl/_testrt/closurebound.init$guard" = global i1 false, align 1
+@"github.com/goplus/llgo/cl/_testrt/closurebound.my" = global { ptr, ptr } zeroinitializer, align 8
+@0 = private unnamed_addr constant [5 x i8] c"error", align 1
+@_llgo_string = linkonce global ptr null, align 8
+
+define i64 @"github.com/goplus/llgo/cl/_testrt/closurebound.demo1.encode"(%"github.com/goplus/llgo/cl/_testrt/closurebound.demo1" %0) {
+_llgo_0:
+  ret i64 1
+}
+
+define i64 @"github.com/goplus/llgo/cl/_testrt/closurebound.(*demo1).encode"(ptr %0) {
+_llgo_0:
+  %1 = load %"github.com/goplus/llgo/cl/_testrt/closurebound.demo1", ptr %0, align 1
+  %2 = call i64 @"github.com/goplus/llgo/cl/_testrt/closurebound.demo1.encode"(%"github.com/goplus/llgo/cl/_testrt/closurebound.demo1" %1)
+  ret i64 %2
+}
+
+define i64 @"github.com/goplus/llgo/cl/_testrt/closurebound.demo2.encode"(%"github.com/goplus/llgo/cl/_testrt/closurebound.demo2" %0) {
+_llgo_0:
+  ret i64 2
+}
+
+define i64 @"github.com/goplus/llgo/cl/_testrt/closurebound.(*demo2).encode"(ptr %0) {
+_llgo_0:
+  %1 = load %"github.com/goplus/llgo/cl/_testrt/closurebound.demo2", ptr %0, align 1
+  %2 = call i64 @"github.com/goplus/llgo/cl/_testrt/closurebound.demo2.encode"(%"github.com/goplus/llgo/cl/_testrt/closurebound.demo2" %1)
+  ret i64 %2
+}
+
+define void @"github.com/goplus/llgo/cl/_testrt/closurebound.init"() {
+_llgo_0:
+  %0 = load i1, ptr @"github.com/goplus/llgo/cl/_testrt/closurebound.init$guard", align 1
+  br i1 %0, label %_llgo_2, label %_llgo_1
+
+_llgo_1:                                          ; preds = %_llgo_0
+  store i1 true, ptr @"github.com/goplus/llgo/cl/_testrt/closurebound.init$guard", align 1
+  call void @"github.com/goplus/llgo/cl/_testrt/closurebound.init$after"()
+  %1 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 0)
+  %2 = getelementptr inbounds { %"github.com/goplus/llgo/cl/_testrt/closurebound.demo2" }, ptr %1, i32 0, i32 0
+  store %"github.com/goplus/llgo/cl/_testrt/closurebound.demo2" zeroinitializer, ptr %2, align 1
+  %3 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testrt/closurebound.demo2.encode$bound", ptr undef }, ptr %1, 1
+  store { ptr, ptr } %3, ptr @"github.com/goplus/llgo/cl/_testrt/closurebound.my", align 8
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  ret void
+}
+
+define void @"github.com/goplus/llgo/cl/_testrt/closurebound.main"() {
+_llgo_0:
+  %0 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 0)
+  %1 = getelementptr inbounds { %"github.com/goplus/llgo/cl/_testrt/closurebound.demo1" }, ptr %0, i32 0, i32 0
+  store %"github.com/goplus/llgo/cl/_testrt/closurebound.demo1" zeroinitializer, ptr %1, align 1
+  %2 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testrt/closurebound.demo1.encode$bound", ptr undef }, ptr %0, 1
+  %3 = extractvalue { ptr, ptr } %2, 1
+  %4 = extractvalue { ptr, ptr } %2, 0
+  %5 = call i64 %4(ptr %3)
+  %6 = icmp ne i64 %5, 1
+  br i1 %6, label %_llgo_1, label %_llgo_2
+
+_llgo_1:                                          ; preds = %_llgo_0
+  %7 = load ptr, ptr @_llgo_string, align 8
+  %8 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/runtime/internal/runtime.String" { ptr @0, i64 5 }, ptr %8, align 8
+  %9 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.eface" undef, ptr %7, 0
+  %10 = insertvalue %"github.com/goplus/llgo/runtime/internal/runtime.eface" %9, ptr %8, 1
+  call void @"github.com/goplus/llgo/runtime/internal/runtime.Panic"(%"github.com/goplus/llgo/runtime/internal/runtime.eface" %10)
+  unreachable
+
+_llgo_2:                                          ; preds = %_llgo_0
+  ret void
+}
+
+define i64 @"github.com/goplus/llgo/cl/_testrt/closurebound.demo2.encode$bound"(ptr %0) {
+_llgo_0:
+  %1 = load { %"github.com/goplus/llgo/cl/_testrt/closurebound.demo2" }, ptr %0, align 1
+  %2 = extractvalue { %"github.com/goplus/llgo/cl/_testrt/closurebound.demo2" } %1, 0
+  %3 = call i64 @"github.com/goplus/llgo/cl/_testrt/closurebound.demo2.encode"(%"github.com/goplus/llgo/cl/_testrt/closurebound.demo2" %2)
+  ret i64 %3
+}
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64)
+
+define i64 @"github.com/goplus/llgo/cl/_testrt/closurebound.demo1.encode$bound"(ptr %0) {
+_llgo_0:
+  %1 = load { %"github.com/goplus/llgo/cl/_testrt/closurebound.demo1" }, ptr %0, align 1
+  %2 = extractvalue { %"github.com/goplus/llgo/cl/_testrt/closurebound.demo1" } %1, 0
+  %3 = call i64 @"github.com/goplus/llgo/cl/_testrt/closurebound.demo1.encode"(%"github.com/goplus/llgo/cl/_testrt/closurebound.demo1" %2)
+  ret i64 %3
+}
+
+define void @"github.com/goplus/llgo/cl/_testrt/closurebound.init$after"() {
+_llgo_0:
+  %0 = load ptr, ptr @_llgo_string, align 8
+  %1 = icmp eq ptr %0, null
+  br i1 %1, label %_llgo_1, label %_llgo_2
+
+_llgo_1:                                          ; preds = %_llgo_0
+  %2 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64 24)
+  store ptr %2, ptr @_llgo_string, align 8
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  ret void
+}
+
+declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.Basic"(i64)
+
+declare void @"github.com/goplus/llgo/runtime/internal/runtime.Panic"(%"github.com/goplus/llgo/runtime/internal/runtime.eface")
diff --git a/cl/_testrt/closureconv/out.ll b/cl/_testrt/closureconv/out.ll
index e693a6b3..52d8a36b 100644
--- a/cl/_testrt/closureconv/out.ll
+++ b/cl/_testrt/closureconv/out.ll
@@ -29,7 +29,7 @@ _llgo_0:
   %3 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 8)
   %4 = getelementptr inbounds { ptr }, ptr %3, i32 0, i32 0
   store ptr %1, ptr %4, align 8
-  %5 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testrt/closureconv.add$bound", ptr undef }, ptr %3, 1
+  %5 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testrt/closureconv.(*Call).add$bound", ptr undef }, ptr %3, 1
   %6 = getelementptr inbounds %"github.com/goplus/llgo/cl/_testrt/closureconv.Call", ptr %1, i32 0, i32 0
   %7 = alloca %"github.com/goplus/llgo/cl/_testrt/closureconv.Func", align 8
   store { ptr, ptr } %5, ptr %7, align 8
@@ -46,7 +46,7 @@ _llgo_0:
   %1 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 8)
   %2 = getelementptr inbounds { ptr }, ptr %1, i32 0, i32 0
   store ptr %0, ptr %2, align 8
-  %3 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testrt/closureconv.add$bound", ptr undef }, ptr %1, 1
+  %3 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testrt/closureconv.(*Call).add$bound", ptr undef }, ptr %1, 1
   %4 = alloca %"github.com/goplus/llgo/cl/_testrt/closureconv.Func", align 8
   store { ptr, ptr } %3, ptr %4, align 8
   %5 = load %"github.com/goplus/llgo/cl/_testrt/closureconv.Func", ptr %4, align 8
@@ -158,7 +158,7 @@ _llgo_0:
 
 declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocZ"(i64)
 
-define i64 @"github.com/goplus/llgo/cl/_testrt/closureconv.add$bound"(ptr %0, i64 %1, i64 %2) {
+define i64 @"github.com/goplus/llgo/cl/_testrt/closureconv.(*Call).add$bound"(ptr %0, i64 %1, i64 %2) {
 _llgo_0:
   %3 = load { ptr }, ptr %0, align 8
   %4 = extractvalue { ptr } %3, 0
diff --git a/cl/_testrt/intgen/out.ll b/cl/_testrt/intgen/out.ll
index c4c821c1..2d0b58ec 100644
--- a/cl/_testrt/intgen/out.ll
+++ b/cl/_testrt/intgen/out.ll
@@ -124,7 +124,7 @@ _llgo_6:                                          ; preds = %_llgo_4
   %32 = call ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64 8)
   %33 = getelementptr inbounds { ptr }, ptr %32, i32 0, i32 0
   store ptr %30, ptr %33, align 8
-  %34 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testrt/intgen.next$bound", ptr undef }, ptr %32, 1
+  %34 = insertvalue { ptr, ptr } { ptr @"github.com/goplus/llgo/cl/_testrt/intgen.(*generator).next$bound", ptr undef }, ptr %32, 1
   %35 = call %"github.com/goplus/llgo/runtime/internal/runtime.Slice" @"github.com/goplus/llgo/cl/_testrt/intgen.genInts"(i64 5, { ptr, ptr } %34)
   %36 = extractvalue %"github.com/goplus/llgo/runtime/internal/runtime.Slice" %35, 1
   br label %_llgo_7
@@ -182,7 +182,7 @@ declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocZ"(i64)
 
 declare ptr @"github.com/goplus/llgo/runtime/internal/runtime.AllocU"(i64)
 
-define i32 @"github.com/goplus/llgo/cl/_testrt/intgen.next$bound"(ptr %0) {
+define i32 @"github.com/goplus/llgo/cl/_testrt/intgen.(*generator).next$bound"(ptr %0) {
 _llgo_0:
   %1 = load { ptr }, ptr %0, align 8
   %2 = extractvalue { ptr } %1, 0
diff --git a/cl/import.go b/cl/import.go
index eab19a21..f5e48c0b 100644
--- a/cl/import.go
+++ b/cl/import.go
@@ -402,6 +402,10 @@ func funcName(pkg *types.Package, fn *ssa.Function, org bool) string {
 		recv = parent.Signature.Recv()
 	} else {
 		recv = fn.Signature.Recv()
+		// check $bound
+		if recv == nil && strings.HasSuffix(fn.Name(), "$bound") && len(fn.FreeVars) == 1 {
+			recv = types.NewVar(token.NoPos, nil, "", fn.FreeVars[0].Type())
+		}
 	}
 	var fnName string
 	if org := fn.Origin(); org != nil {