diff --git a/goast.go b/goast.go
index aeb3fe8..0c6049c 100644
--- a/goast.go
+++ b/goast.go
@@ -10,6 +10,7 @@ import (
 
 type Parser struct {
 	source *os.File
+	debug  bool
 }
 
 type Defines struct {
@@ -39,7 +40,9 @@ func (ps *Parser) Parse() (*Defines, error) {
 		return nil, err
 	}
 
-	//ast.Print(tokenSet, astFile)
+	if ps.debug {
+		_ = ast.Print(tokenSet, astFile)
+	}
 
 	var defines = &Defines{
 		variable: make(map[string]struct{}),
@@ -86,6 +89,10 @@ func (ps *Parser) Parse() (*Defines, error) {
 	return defines, nil
 }
 
+func (ps *Parser) Debug() {
+	ps.debug = true
+}
+
 func (d *Defines) ExistVariable(name string) bool {
 	_, exist := d.variable[name]
 	return exist
diff --git a/goast_test.go b/goast_test.go
index d45bd11..c4c10aa 100644
--- a/goast_test.go
+++ b/goast_test.go
@@ -2,14 +2,15 @@ package goast_test
 
 import (
 	"fmt"
+	"gitter.top/coco/goast"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"gitter.top/coco/goast"
 )
 
 func TestParser_Parse(t *testing.T) {
 	parser, err := goast.NewParser("./testdata/main.go")
+	parser.Debug()
 	assert.NoError(t, err)
 	defines, err := parser.Parse()
 	assert.NoError(t, err)
diff --git a/testdata/main.go b/testdata/main.go
index 5907569..3af0d78 100644
--- a/testdata/main.go
+++ b/testdata/main.go
@@ -1,19 +1,26 @@
 package goast
 
-import (
-	_ "github.com/stretchr/testify"
-)
+import "gitter.top/coco/coco/core"
 
-var a = 1
+type ExampleService struct{}
 
-const d = "world"
+// IDE: ExampleService implemented main.ExampleServiceImpl interface
+var _ main.ExampleServiceImpl = (*ExampleService)(nil)
 
-func hello() {
+// ExampleCall1 test rpc
+func (receiver *ExampleService) ExampleCall1(ctx *core.Context, req *main.ExampleMessage1) (resp *main.ReturnType, err error) {
+	resp = new(main.ReturnType)
 
+	// TODO impl...
+
+	return resp, nil
 }
 
-type c int
+// ExampleCall2
+func (receiver *ExampleService) ExampleCall2(ctx *core.Context, req *main.ExampleMessage2) (resp *main.ReturnType, err error) {
+	resp = new(main.ReturnType)
 
-func (cc c) name() {
+	// TODO impl...
 
+	return resp, nil
 }
diff --git a/util.go b/util.go
index 2760d10..dac6413 100644
--- a/util.go
+++ b/util.go
@@ -4,7 +4,10 @@ import "go/ast"
 
 // getKVFromImportSpec get import name and package path from *ast.ImportSpec
 func getKVFromImportSpec(impt *ast.ImportSpec) (string, string) {
-	name := impt.Name.Name
+	var name string
+	if impt.Name != nil {
+		name = impt.Name.Name
+	}
 	pkg := impt.Path.Value
 	return name, pkg
 }
@@ -12,20 +15,39 @@ func getKVFromImportSpec(impt *ast.ImportSpec) (string, string) {
 // getKVFromValueSpec get const/variable name and value from *ast.ValueSpec
 func getKVFromValueSpec(spec *ast.ValueSpec) (string, string) {
 	name := spec.Names[0].Name
-	value := spec.Values[0].(*ast.BasicLit).Value
+	var value string
+	switch spec.Values[0].(type) {
+	case *ast.BasicLit:
+		value = spec.Values[0].(*ast.BasicLit).Value
+	case *ast.CallExpr:
+		value = "@call"
+	}
 	return name, value
 }
 
 // getKVFromTypeSpec get type name and base type from *ast.TypeSpec
 func getKVFromTypeSpec(spec *ast.TypeSpec) (string, string) {
 	name := spec.Name.Name
-	value := spec.Type.(*ast.Ident).Name
+	var value string
+	switch spec.Type.(type) {
+	case *ast.Ident:
+		value = spec.Type.(*ast.Ident).Name
+	case *ast.StructType:
+		value = "@raw"
+	}
 	return name, value
 }
 
 // getMethodNameFromReceiveField get method type and receiver name from Recv field
 func getMethodNameFromReceiveField(recv *ast.FieldList) (string, string) {
-	methodType := recv.List[0].Type.(*ast.Ident).Name
-	receiver := recv.List[0].Names[0].Name
+	var methodType, receiver string
+	switch recv.List[0].Type.(type) {
+	case *ast.Ident:
+		methodType = recv.List[0].Type.(*ast.Ident).Name
+	case *ast.StarExpr:
+		methodType = recv.List[0].Type.(*ast.StarExpr).X.(*ast.Ident).Name
+	}
+
+	receiver = recv.List[0].Names[0].Name
 	return methodType, receiver
 }