Refactor from fmt.errorf into errors.New

baseapp/fraudproof.go

@@ -3,6 +3,7 @@ package baseapp
 import (
 	"bytes"
 	"crypto/sha256"
+	"errors"
 	"fmt"
 
 	"github.com/cosmos/cosmos-sdk/store/types"
@@ -13,6 +14,10 @@ import (
 	tmcrypto "github.com/tendermint/tendermint/proto/tendermint/crypto"
 )
 
+var (
+	ErrMoreThanOneBlockTypeUsed = errors.New("fraudProof has more than one type of fradulent state transitions marked nil")
+)
+
 // Represents a single-round fraudProof
 type FraudProof struct {
 	// The block height to load state of
@@ -92,7 +97,7 @@ func (fraudProof *FraudProof) checkFraudulentStateTransition() bool {
 
 func (fraudProof *FraudProof) verifyFraudProof() (bool, error) {
 	if !fraudProof.checkFraudulentStateTransition() {
-		return false, fmt.Errorf("fraudProof has more than one type of fradulent state transitions marked nil")
+		return false, ErrMoreThanOneBlockTypeUsed
 	}
 	for storeKey, stateWitness := range fraudProof.stateWitness {
 		proofOp := stateWitness.Proof

store/tracekv/store.go

@@ -4,12 +4,11 @@ import (
 	"bytes"
 	"encoding/base64"
 	"encoding/json"
-	"fmt"
+	"errors"
 	"io"
 
 	"github.com/chrispappas/golang-generics-set/set"
 	"github.com/cosmos/cosmos-sdk/store/types"
-	"github.com/cosmos/cosmos-sdk/types/errors"
 )
 
 const (
@@ -21,7 +20,7 @@ const (
 )
 
 var (
-	ErrBufferEmpty = fmt.Errorf("provided buffer is empty")
+	ErrBufferEmpty = errors.New("provided buffer is empty")
 )
 
 type (