fix: nil pointer

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
 }