2 files changed, 5 insertions, 23 deletions
diff --git a/core/vm/errors.go b/core/vm/errors.go
index 799eb6797..75b9c0f10 100644
--- a/core/vm/errors.go
+++ b/core/vm/errors.go
@@ -1,21 +1,14 @@
 package vm
 
 import (
+	"errors"
 	"fmt"
 
 	"github.com/ethereum/go-ethereum/params"
 )
 
-type OutOfGasError struct{}
-
-func (self OutOfGasError) Error() string {
-	return "Out Of Gas"
-}
-
-func IsOOGErr(err error) bool {
-	_, ok := err.(OutOfGasError)
-	return ok
-}
+var OutOfGasError = errors.New("Out of gas")
+var DepthError = fmt.Errorf("Max call depth exceeded (%d)", params.CallCreateDepth)
 
 type StackError struct {
 	req, has int
@@ -33,14 +26,3 @@ func IsStack(err error) bool {
 	_, ok := err.(StackError)
 	return ok
 }
-
-type DepthError struct{}
-
-func (self DepthError) Error() string {
-	return fmt.Sprintf("Max call depth exceeded (%d)", params.CallCreateDepth)
-}
-
-func IsDepthErr(err error) bool {
-	_, ok := err.(DepthError)
-	return ok
-}
diff --git a/core/vm/vm.go b/core/vm/vm.go
index ba803683b..e390fb89c 100644
--- a/core/vm/vm.go
+++ b/core/vm/vm.go
@@ -116,7 +116,7 @@ func (self *Vm) Run(context *Context, input []byte) (ret []byte, err error) {
 
 			context.UseGas(context.Gas)
 
-			return context.Return(nil), OutOfGasError{}
+			return context.Return(nil), OutOfGasError
 		}
 		// Resize the memory calculated previously
 		mem.Resize(newMemSize.Uint64())
@@ -789,7 +789,7 @@ func (self *Vm) RunPrecompiled(p *PrecompiledAccount, input []byte, context *Con
 
 		return context.Return(ret), nil
 	} else {
-		return nil, OutOfGasError{}
+		return nil, OutOfGasError
 	}
 }