chore: use errors.New to replace fmt.Errorf with no parameters

main_test.go

@@ -17,6 +17,7 @@
 package gsrpc_test
 
 import (
+	"errors"
 	"fmt"
 	"github.com/centrifuge/go-substrate-rpc-client/v4/types/extrinsic"
 	"math/big"
@@ -207,7 +208,7 @@ func Example_makeASimpleTransfer() {
 	// 1 unit of transfer
 	bal, ok := new(big.Int).SetString("100000000000000", 10)
 	if !ok {
-		panic(fmt.Errorf("failed to convert balance"))
+		panic(errors.New("failed to convert balance"))
 	}
 
 	c, err := types.NewCall(meta, "Balances.transfer", bob, types.NewUCompact(bal))

types/address.go

@@ -17,8 +17,7 @@
 package types
 
 import (
-	"fmt"
-
+	"errors"
 	"github.com/centrifuge/go-substrate-rpc-client/v4/scale"
 	"github.com/centrifuge/go-substrate-rpc-client/v4/types/codec"
 )
@@ -91,7 +90,7 @@ func (a *Address) Decode(decoder scale.Decoder) error {
 	}
 
 	if b == 0xfe {
-		return fmt.Errorf("decoding of Address with 0xfe prefix not supported")
+		return errors.New("decoding of Address with 0xfe prefix not supported")
 	}
 
 	if b == 0xfd {

types/digest_item.go

@@ -17,8 +17,7 @@
 package types
 
 import (
-	"fmt"
-
+	"errors"
 	"github.com/centrifuge/go-substrate-rpc-client/v4/scale"
 )
 
@@ -151,7 +150,7 @@ func (c ChangesTrieSignal) Encode(encoder scale.Encoder) error {
 			return err
 		}
 	default:
-		return fmt.Errorf("no such variant for ChangesTrieSignal")
+		return errors.New("no such variant for ChangesTrieSignal")
 	}
 
 	return nil
@@ -171,7 +170,7 @@ func (c *ChangesTrieSignal) Decode(decoder scale.Decoder) error {
 			return err
 		}
 	default:
-		return fmt.Errorf("no such variant for ChangesTrieSignal")
+		return errors.New("no such variant for ChangesTrieSignal")
 	}
 
 	return nil

types/metadata.go

@@ -17,6 +17,7 @@
 package types
 
 import (
+	"errors"
 	"fmt"
 	"hash"
 	"strings"
@@ -240,7 +241,7 @@ func (m *Metadata) FindConstantValue(module string, constantName string) ([]byte
 	case 14:
 		return m.AsMetadataV14.FindConstantValue(txtModule, txtConstantName)
 	default:
-		return nil, fmt.Errorf("unsupported metadata version")
+		return nil, errors.New("unsupported metadata version")
 	}
 }
 
@@ -265,7 +266,7 @@ func (m *Metadata) FindCallIndex(call string) (CallIndex, error) {
 	case 14:
 		return m.AsMetadataV14.FindCallIndex(call)
 	default:
-		return CallIndex{}, fmt.Errorf("unsupported metadata version")
+		return CallIndex{}, errors.New("unsupported metadata version")
 	}
 }
 
@@ -290,7 +291,7 @@ func (m *Metadata) FindEventNamesForEventID(eventID EventID) (Text, Text, error)
 	case 14:
 		return m.AsMetadataV14.FindEventNamesForEventID(eventID)
 	default:
-		return "", "", fmt.Errorf("unsupported metadata version")
+		return "", "", errors.New("unsupported metadata version")
 	}
 }
 
@@ -315,7 +316,7 @@ func (m *Metadata) FindStorageEntryMetadata(module string, fn string) (StorageEn
 	case 14:
 		return m.AsMetadataV14.FindStorageEntryMetadata(module, fn)
 	default:
-		return nil, fmt.Errorf("unsupported metadata version")
+		return nil, errors.New("unsupported metadata version")
 	}
 }
 
@@ -351,5 +352,5 @@ func DefaultPlainHasher(entry StorageEntryMetadata) (hash.Hash, error) {
 		return xxhash.New128(nil), nil
 	}
 
-	return nil, fmt.Errorf("Hasher() is only to be called on a Plain entry")
+	return nil, errors.New("Hasher() is only to be called on a Plain entry")
 }

types/metadataV10.go

@@ -233,7 +233,7 @@ func (s StorageFunctionMetadataV10) IsMap() bool {
 
 func (s StorageFunctionMetadataV10) Hashers() ([]hash.Hash, error) {
 	if !s.IsMap() {
-		return nil, fmt.Errorf("Hashers() is only to be called on Maps")
+		return nil, errors.New("Hashers() is only to be called on Maps")
 	}
 
 	var hashers = collectHashersV10(s.Type)

types/metadataV7.go

@@ -17,6 +17,7 @@
 package types
 
 import (
+	"errors"
 	"fmt"
 	"hash"
 	"strings"
@@ -220,7 +221,7 @@ func (s StorageFunctionMetadataV5) IsMap() bool {
 
 func (s StorageFunctionMetadataV5) Hashers() ([]hash.Hash, error) {
 	if !s.IsMap() {
-		return nil, fmt.Errorf("Hashers() is only to be called on Maps")
+		return nil, errors.New("Hashers() is only to be called on Maps")
 	}
 
 	var hashers = collectHashersV5(s.Type)

types/uint.go

@@ -18,6 +18,7 @@ package types
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"math/big"
 
@@ -237,7 +238,7 @@ func (i U256) Encode(encoder scale.Encoder) error {
 // length could hold
 func BigIntToUintBytes(i *big.Int, bytelen int) ([]byte, error) {
 	if i.Sign() < 0 {
-		return nil, fmt.Errorf("cannot encode a negative big.Int into an unsigned integer")
+		return nil, errors.New("cannot encode a negative big.Int into an unsigned integer")
 	}
 
 	max := big.NewInt(0).Exp(big.NewInt(2), big.NewInt(int64(bytelen*8)), nil)