cmd/evm: add --prestate, --sender, --json flags for fuzzing (#14476)

internal/ethapi/tracer.go

@@ -21,6 +21,7 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -344,6 +345,12 @@ func (jst *JavascriptTracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode,
 	return nil
 }
 
+// CaptureEnd is called after the call finishes
+func (jst *JavascriptTracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration) error {
+	//TODO! @Arachnid please figure out of there's anything we can use this method for
+	return nil
+}
+
 // GetResult calls the Javascript 'result' function and returns its value, or any accumulated error
 func (jst *JavascriptTracer) GetResult() (result interface{}, err error) {
 	if jst.err != nil {