core/vm: Improved error reporting for trace logging

core/vm/errors.go

@@ -2,20 +2,14 @@ package vm
 
 import (
 	"fmt"
+
 	"github.com/ethereum/go-ethereum/params"
-	"math/big"
 )
 
-type OutOfGasError struct {
-	req, has *big.Int
-}
-
-func OOG(req, has *big.Int) OutOfGasError {
-	return OutOfGasError{req, has}
-}
+type OutOfGasError struct{}
 
 func (self OutOfGasError) Error() string {
-	return fmt.Sprintf("out of gas! require %v, have %v", self.req, self.has)
+	return "Out Of Gas"
 }
 
 func IsOOGErr(err error) bool {