binding: avoid name conflicts with Go keywords

And clashing one name on another after rename.

cli/smartcontract/generate_test.go

@@ -45,6 +45,15 @@ func TestGenerate(t *testing.T) {
 			ReturnType: smartcontract.IntegerType,
 			Safe:       true,
 		},
+		manifest.Method{
+			Name: "zum",
+			Parameters: []manifest.Parameter{
+				manifest.NewParameter("type", smartcontract.IntegerType),
+				manifest.NewParameter("typev", smartcontract.IntegerType),
+				manifest.NewParameter("func", smartcontract.IntegerType),
+			},
+			ReturnType: smartcontract.IntegerType,
+		},
 		manifest.Method{
 			Name: "justExecute",
 			Parameters: []manifest.Parameter{
@@ -172,6 +181,11 @@ func Sum3() int {
 	return neogointernal.CallWithToken(Hash, "sum3", int(contract.ReadOnly)).(int)
 }
 
+// Zum invokes ` + "`zum`" + ` method of contract.
+func Zum(typev int, typev_ int, funcv int) int {
+	return neogointernal.CallWithToken(Hash, "zum", int(contract.All), typev, typev_, funcv).(int)
+}
+
 // JustExecute invokes ` + "`justExecute`" + ` method of contract.
 func JustExecute(arr []interface{}) {
 	neogointernal.CallWithTokenNoRet(Hash, "justExecute", int(contract.All), arr)

cli/smartcontract/testdata/nameservice/nns.go

@@ -47,8 +47,8 @@ func (c *ContractReader) IsAvailable(name string) (bool, error) {
 }
 
 // GetRecord invokes `getRecord` method of contract.
-func (c *ContractReader) GetRecord(name string, type *big.Int) (string, error) {
+func (c *ContractReader) GetRecord(name string, typev *big.Int) (string, error) {
-	return unwrap.UTF8String(c.invoker.Call(Hash, "getRecord", name, type))
+	return unwrap.UTF8String(c.invoker.Call(Hash, "getRecord", name, typev))
 }
 
 // GetAllRecords invokes `getAllRecords` method of contract.
@@ -57,6 +57,6 @@ func (c *ContractReader) GetAllRecords(name string) (stackitem.Item, error) {
 }
 
 // Resolve invokes `resolve` method of contract.
-func (c *ContractReader) Resolve(name string, type *big.Int) (string, error) {
+func (c *ContractReader) Resolve(name string, typev *big.Int) (string, error) {
-	return unwrap.UTF8String(c.invoker.Call(Hash, "resolve", name, type))
+	return unwrap.UTF8String(c.invoker.Call(Hash, "resolve", name, typev))
 }

pkg/smartcontract/binding/generate.go

@@ -3,6 +3,7 @@ package binding
 import (
 	"bytes"
 	"fmt"
+	"go/token"
 	"io"
 	"sort"
 	"strconv"
@@ -201,6 +202,8 @@ func TemplateFromManifest(cfg Config, scTypeConverter func(string, smartcontract
 		} else if m.Safe {
 			mtd.CallFlag = callflag.ReadOnly.String()
 		}
+
+		var varnames = make(map[string]bool)
 		for i := range m.Parameters {
 			name := m.Parameters[i].Name
 			if name == "" {
@@ -211,7 +214,13 @@ func TemplateFromManifest(cfg Config, scTypeConverter func(string, smartcontract
 			if pkg != "" {
 				imports[pkg] = struct{}{}
 			}
-
+			if token.IsKeyword(name) {
+				name = name + "v"
+			}
+			for varnames[name] {
+				name = name + "_"
+			}
+			varnames[name] = true
 			mtd.Arguments = append(mtd.Arguments, ParamTmpl{
 				Name: name,
 				Type: typeStr,