diff --git a/bind/gen.go b/bind/gen.go
index c072499..74646c1 100644
--- a/bind/gen.go
+++ b/bind/gen.go
@@ -484,7 +484,19 @@ func (g *Generator) isSupported(t types.Type) bool {
 	}
 	switch t := t.(type) {
 	case *types.Basic:
-		return true
+		switch t.Kind() {
+		case types.Bool, types.UntypedBool,
+			types.Int,
+			types.Int8, types.Uint8, // types.Byte
+			types.Int16,
+			types.Int32, types.UntypedRune, // types.Rune
+			types.Int64, types.UntypedInt,
+			types.Float32,
+			types.Float64, types.UntypedFloat,
+			types.String, types.UntypedString:
+			return true
+		}
+		return false
 	case *types.Slice:
 		switch e := t.Elem().(type) {
 		case *types.Basic:
diff --git a/bind/gengo.go b/bind/gengo.go
index 4b6a22e..4ab7219 100644
--- a/bind/gengo.go
+++ b/bind/gengo.go
@@ -206,7 +206,7 @@ func (g *goGen) genStruct(obj *types.TypeName, T *types.Struct) {
 
 	for _, f := range fields {
 		if t := f.Type(); !g.isSupported(t) {
-			g.Printf("// skipped field %s.%s with unsupported type: %T\n\n", obj.Name(), f.Name(), t)
+			g.Printf("// skipped field %s.%s with unsupported type: %s\n\n", obj.Name(), f.Name(), t)
 			continue
 		}
 		g.Printf("//export proxy%s_%s_%s_Set\n", g.pkgPrefix, obj.Name(), f.Name())
@@ -253,7 +253,7 @@ func (g *goGen) genStruct(obj *types.TypeName, T *types.Struct) {
 
 func (g *goGen) genVar(o *types.Var) {
 	if t := o.Type(); !g.isSupported(t) {
-		g.Printf("// skipped variable %s with unsupported type %T\n\n", o.Name(), t)
+		g.Printf("// skipped variable %s with unsupported type %s\n\n", o.Name(), t)
 		return
 	}
 	// TODO(hyangah): non-struct pointer types (*int), struct type.
diff --git a/bind/genjava.go b/bind/genjava.go
index 970dc81..545f04f 100644
--- a/bind/genjava.go
+++ b/bind/genjava.go
@@ -313,7 +313,7 @@ func (g *JavaGen) genStruct(s structInfo) {
 
 	for _, f := range fields {
 		if t := f.Type(); !g.isSupported(t) {
-			g.Printf("// skipped field %s.%s with unsupported type: %T\n\n", n, f.Name(), t)
+			g.Printf("// skipped field %s.%s with unsupported type: %s\n\n", n, f.Name(), t)
 			continue
 		}
 
@@ -465,7 +465,7 @@ func (g *JavaGen) genObjectMethods(n string, fields []*types.Var, isStringer boo
 	g.Printf("%s that = (%s)o;\n", n, n)
 	for _, f := range fields {
 		if t := f.Type(); !g.isSupported(t) {
-			g.Printf("// skipped field %s.%s with unsupported type: %T\n\n", n, f.Name(), t)
+			g.Printf("// skipped field %s.%s with unsupported type: %s\n\n", n, f.Name(), t)
 			continue
 		}
 		nf := f.Name()
@@ -840,7 +840,7 @@ func (g *JavaGen) genFuncSignature(o *types.Func, jm *java.Func, hasThis bool) {
 
 func (g *JavaGen) genVar(o *types.Var) {
 	if t := o.Type(); !g.isSupported(t) {
-		g.Printf("// skipped variable %s with unsupported type: %T\n\n", o.Name(), t)
+		g.Printf("// skipped variable %s with unsupported type: %s\n\n", o.Name(), t)
 		return
 	}
 	jType := g.javaType(o.Type())
@@ -1020,8 +1020,8 @@ func JavaClassName(pkg *types.Package) string {
 }
 
 func (g *JavaGen) genConst(o *types.Const) {
-	if _, ok := o.Type().(*types.Basic); !ok {
-		g.Printf("// skipped const %s with unsupported type: %T\n\n", o.Name(), o)
+	if _, ok := o.Type().(*types.Basic); !ok || !g.isSupported(o.Type()) {
+		g.Printf("// skipped const %s with unsupported type: %s\n\n", o.Name(), o.Type())
 		return
 	}
 	// TODO(hyangah): should const names use upper cases + "_"?
@@ -1055,7 +1055,7 @@ func (g *JavaGen) genConst(o *types.Const) {
 
 func (g *JavaGen) genJNIField(o *types.TypeName, f *types.Var) {
 	if t := f.Type(); !g.isSupported(t) {
-		g.Printf("// skipped field %s with unsupported type: %T\n\n", o.Name(), t)
+		g.Printf("// skipped field %s with unsupported type: %s\n\n", o.Name(), t)
 		return
 	}
 	n := java.JNIMangle(g.javaTypeName(o.Name()))
@@ -1085,7 +1085,7 @@ func (g *JavaGen) genJNIField(o *types.TypeName, f *types.Var) {
 
 func (g *JavaGen) genJNIVar(o *types.Var) {
 	if t := o.Type(); !g.isSupported(t) {
-		g.Printf("// skipped variable %s with unsupported type: %T\n\n", o.Name(), t)
+		g.Printf("// skipped variable %s with unsupported type: %s\n\n", o.Name(), t)
 		return
 	}
 	n := java.JNIMangle(g.javaTypeName(o.Name()))
diff --git a/bind/genobjc.go b/bind/genobjc.go
index 2edb401..d24a87d 100644
--- a/bind/genobjc.go
+++ b/bind/genobjc.go
@@ -190,8 +190,8 @@ func (g *ObjcGen) GenH() error {
 	// const
 	// TODO: prefix with k?, or use a class method?
 	for _, obj := range g.constants {
-		if _, ok := obj.Type().(*types.Basic); !ok {
-			g.Printf("// skipped const %s with unsupported type: %T\n\n", obj.Name(), obj)
+		if _, ok := obj.Type().(*types.Basic); !ok || !g.isSupported(obj.Type()) {
+			g.Printf("// skipped const %s with unsupported type: %s\n\n", obj.Name(), obj.Type())
 			continue
 		}
 		g.objcdoc(g.docs[obj.Name()].Doc())
@@ -211,7 +211,7 @@ func (g *ObjcGen) GenH() error {
 		g.Printf("@interface %s : NSObject\n", g.namePrefix)
 		for _, obj := range g.vars {
 			if t := obj.Type(); !g.isSupported(t) {
-				g.Printf("// skipped variable %s with unsupported type: %T\n\n", obj.Name(), t)
+				g.Printf("// skipped variable %s with unsupported type: %s\n\n", obj.Name(), t)
 				continue
 			}
 			objcType := g.objcType(obj.Type())
@@ -338,7 +338,7 @@ func (g *ObjcGen) GenM() error {
 
 func (g *ObjcGen) genVarM(o *types.Var) {
 	if t := o.Type(); !g.isSupported(t) {
-		g.Printf("// skipped variable %s with unsupported type: %T\n\n", o.Name(), t)
+		g.Printf("// skipped variable %s with unsupported type: %s\n\n", o.Name(), t)
 		return
 	}
 	objcType := g.objcType(o.Type())
@@ -364,8 +364,8 @@ func (g *ObjcGen) genVarM(o *types.Var) {
 }
 
 func (g *ObjcGen) genConstM(o *types.Const) {
-	if _, ok := o.Type().(*types.Basic); !ok {
-		g.Printf("// skipped const %s with unsupported type: %T\n\n", o.Name(), o)
+	if _, ok := o.Type().(*types.Basic); !ok || !g.isSupported(o.Type()) {
+		g.Printf("// skipped const %s with unsupported type: %s\n\n", o.Name(), o.Type())
 		return
 	}
 	cName := fmt.Sprintf("%s%s", g.namePrefix, o.Name())
@@ -1114,7 +1114,7 @@ func (g *ObjcGen) genStructH(obj *types.TypeName, t *types.Struct) {
 	// accessors to exported fields.
 	for _, f := range exportedFields(t) {
 		if t := f.Type(); !g.isSupported(t) {
-			g.Printf("// skipped field %s.%s with unsupported type: %T\n\n", obj.Name(), f.Name(), t)
+			g.Printf("// skipped field %s.%s with unsupported type: %s\n\n", obj.Name(), f.Name(), t)
 			continue
 		}
 		name, typ := f.Name(), g.objcFieldType(f.Type())
@@ -1184,7 +1184,7 @@ func (g *ObjcGen) genStructM(obj *types.TypeName, t *types.Struct) {
 
 	for _, f := range fields {
 		if !g.isSupported(f.Type()) {
-			g.Printf("// skipped unsupported field %s with type %T\n\n", f.Name(), f)
+			g.Printf("// skipped unsupported field %s with type %s\n\n", f.Name(), f.Type())
 			continue
 		}
 		g.genGetter(obj.Name(), f)
diff --git a/bind/testdata/ignore.go b/bind/testdata/ignore.go
index f51e901..2d3e1a6 100644
--- a/bind/testdata/ignore.go
+++ b/bind/testdata/ignore.go
@@ -43,3 +43,17 @@ type I interface {
 	Argument(_ interface{})
 	Result() interface{}
 }
+
+var (
+	Uint   uint
+	Uint32 uint32
+	Uint64 uint64
+	C64    complex64  = 0
+	C128   complex128 = 0
+)
+
+const (
+	Cuint   uint   = 0
+	Cuint32 uint32 = 0
+	Cuint64 uint64 = 0
+)
diff --git a/bind/testdata/ignore.go.golden b/bind/testdata/ignore.go.golden
index ed73288..abcdb91 100644
--- a/bind/testdata/ignore.go.golden
+++ b/bind/testdata/ignore.go.golden
@@ -21,7 +21,7 @@ import (
 // suppress the error if seq ends up unused
 var _ = _seq.FromRefNum
 
-// skipped field S.F with unsupported type: *types.Interface
+// skipped field S.F with unsupported type: interface{}
 
 // skipped method S.Argument with unsupported parameter or return types
 
@@ -42,9 +42,19 @@ func (p *proxyignore_I) Bind_proxy_refnum__() int32 { return (*_seq.Ref)(p).Bind
 
 // skipped method I.Argument with unsupported parameter or result types
 // skipped method I.Result with unsupported parameter or result types
-// skipped variable V with unsupported type *types.Interface
+// skipped variable C128 with unsupported type complex128
 
-// skipped variable Var with unsupported type *types.Interface
+// skipped variable C64 with unsupported type complex64
+
+// skipped variable Uint with unsupported type uint
+
+// skipped variable Uint32 with unsupported type uint32
+
+// skipped variable Uint64 with unsupported type uint64
+
+// skipped variable V with unsupported type interface{}
+
+// skipped variable Var with unsupported type interface{}
 
 // skipped function Argument with unsupported parameter or result types
 // skipped function Result with unsupported parameter or result types
diff --git a/bind/testdata/ignore.java.c.golden b/bind/testdata/ignore.java.c.golden
index 9be1408..6a29ff0 100644
--- a/bind/testdata/ignore.java.c.golden
+++ b/bind/testdata/ignore.java.c.golden
@@ -49,7 +49,7 @@ Java_ignore_S__1_1New(JNIEnv *env, jclass clazz) {
 
 // skipped function S.Result with unsupported parameter or return types
 
-// skipped field S with unsupported type: *types.Interface
+// skipped field S with unsupported type: interface{}
 
 // skipped function I.Argument with unsupported parameter or return types
 
@@ -59,7 +59,17 @@ Java_ignore_S__1_1New(JNIEnv *env, jclass clazz) {
 
 // skipped method I with unsupported parameter or return types
 
-// skipped variable V with unsupported type: *types.Interface
+// skipped variable C128 with unsupported type: complex128
 
-// skipped variable Var with unsupported type: *types.Interface
+// skipped variable C64 with unsupported type: complex64
+
+// skipped variable Uint with unsupported type: uint
+
+// skipped variable Uint32 with unsupported type: uint32
+
+// skipped variable Uint64 with unsupported type: uint64
+
+// skipped variable V with unsupported type: interface{}
+
+// skipped variable Var with unsupported type: interface{}
 
diff --git a/bind/testdata/ignore.java.golden b/bind/testdata/ignore.java.golden
index 6255635..d00b3b7 100644
--- a/bind/testdata/ignore.java.golden
+++ b/bind/testdata/ignore.java.golden
@@ -23,7 +23,7 @@ public final class S implements Seq.Proxy, I {
     
     private static native Seq.Ref __New();
     
-    // skipped field S.F with unsupported type: *types.Interface
+    // skipped field S.F with unsupported type: interface{}
     
     // skipped method S.Argument with unsupported parameter or return types
     
@@ -34,7 +34,7 @@ public final class S implements Seq.Proxy, I {
             return false;
         }
         S that = (S)o;
-        // skipped field S.F with unsupported type: *types.Interface
+        // skipped field S.F with unsupported type: interface{}
         
         return true;
     }
@@ -104,12 +104,28 @@ public abstract class Ignore {
         
     }
     
-    // skipped const NamedConst with unsupported type: *types.Const
+    // skipped const Cuint with unsupported type: uint
+    
+    // skipped const Cuint32 with unsupported type: uint32
+    
+    // skipped const Cuint64 with unsupported type: uint64
+    
+    // skipped const NamedConst with unsupported type: ignore.NamedString
     
     
-    // skipped variable V with unsupported type: *types.Interface
+    // skipped variable C128 with unsupported type: complex128
     
-    // skipped variable Var with unsupported type: *types.Interface
+    // skipped variable C64 with unsupported type: complex64
+    
+    // skipped variable Uint with unsupported type: uint
+    
+    // skipped variable Uint32 with unsupported type: uint32
+    
+    // skipped variable Uint64 with unsupported type: uint64
+    
+    // skipped variable V with unsupported type: interface{}
+    
+    // skipped variable Var with unsupported type: interface{}
     
     // skipped function Argument with unsupported parameter or return types
     
diff --git a/bind/testdata/ignore.objc.h.golden b/bind/testdata/ignore.objc.h.golden
index 38656b9..3004348 100644
--- a/bind/testdata/ignore.objc.h.golden
+++ b/bind/testdata/ignore.objc.h.golden
@@ -27,7 +27,7 @@
 
 - (instancetype)initWithRef:(id)ref;
 - (instancetype)init;
-// skipped field S.F with unsupported type: *types.Interface
+// skipped field S.F with unsupported type: interface{}
 
 // skipped method S.Argument with unsupported parameter or return types
 
@@ -35,13 +35,29 @@
 
 @end
 
-// skipped const NamedConst with unsupported type: *types.Const
+// skipped const Cuint with unsupported type: uint
+
+// skipped const Cuint32 with unsupported type: uint32
+
+// skipped const Cuint64 with unsupported type: uint64
+
+// skipped const NamedConst with unsupported type: ignore.NamedString
 
 
 @interface Ignore : NSObject
-// skipped variable V with unsupported type: *types.Interface
+// skipped variable C128 with unsupported type: complex128
 
-// skipped variable Var with unsupported type: *types.Interface
+// skipped variable C64 with unsupported type: complex64
+
+// skipped variable Uint with unsupported type: uint
+
+// skipped variable Uint32 with unsupported type: uint32
+
+// skipped variable Uint64 with unsupported type: uint64
+
+// skipped variable V with unsupported type: interface{}
+
+// skipped variable Var with unsupported type: interface{}
 
 @end
 
diff --git a/bind/testdata/ignore.objc.m.golden b/bind/testdata/ignore.objc.m.golden
index 2e536c7..074cbce 100644
--- a/bind/testdata/ignore.objc.m.golden
+++ b/bind/testdata/ignore.objc.m.golden
@@ -26,7 +26,7 @@
 	return self;
 }
 
-// skipped unsupported field F with type *types.Var
+// skipped unsupported field F with type interface{}
 
 // skipped method S.Argument with unsupported parameter or return types
 
@@ -51,13 +51,29 @@
 @end
 
 
-// skipped const NamedConst with unsupported type: *types.Const
+// skipped const Cuint with unsupported type: uint
+
+// skipped const Cuint32 with unsupported type: uint32
+
+// skipped const Cuint64 with unsupported type: uint64
+
+// skipped const NamedConst with unsupported type: ignore.NamedString
 
 
 @implementation Ignore
-// skipped variable V with unsupported type: *types.Interface
+// skipped variable C128 with unsupported type: complex128
 
-// skipped variable Var with unsupported type: *types.Interface
+// skipped variable C64 with unsupported type: complex64
+
+// skipped variable Uint with unsupported type: uint
+
+// skipped variable Uint32 with unsupported type: uint32
+
+// skipped variable Uint64 with unsupported type: uint64
+
+// skipped variable V with unsupported type: interface{}
+
+// skipped variable Var with unsupported type: interface{}
 
 @end