Add iota for incremental data

cmd/evm/internal/t8ntool/transition.go

@@ -39,17 +39,16 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/tests"
-	"github.com/urfave/cli/v2"
 )
 
 const (
-	ErrorEVM              = 2
-	ErrorConfig           = 3
-	ErrorMissingBlockhash = 4
+	ErrorEVM = iota + 2
+	ErrorConfig
+	ErrorMissingBlockhash
 
-	ErrorJson = 10
-	ErrorIO   = 11
-	ErrorRlp  = 12
+	ErrorJson
+	ErrorIO
+	ErrorRlp
 
 	stdinSelector = "stdin"
 )

cmd/utils/cmd.go

@@ -41,7 +41,7 @@ import (
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/node"
 	"github.com/ethereum/go-ethereum/rlp"
-	"github.com/urfave/cli/v2"
+    "github.com/urfave/cli/v2"
 )
 
 const (
@@ -387,9 +387,10 @@ type exportHeader struct {
 }
 
 const exportMagic = "gethdbdump"
+
 const (
-	OpBatchAdd = 0
-	OpBatchDel = 1
+	OpBatchAdd = iota
+	OpBatchDel
 )
 
 // ImportLDBData imports a batch of snapshot data into the database

eth/protocols/eth/protocol.go

@@ -30,9 +30,9 @@ import (
 
 // Constants to match up protocol versions and messages
 const (
-	ETH66 = 66
-	ETH67 = 67
-	ETH68 = 68
+	ETH66 = iota + 66
+	ETH67
+	ETH68
 )
 
 // ProtocolName is the official short name of the `eth` protocol used during