Remove unnecessary vars

decode.go

@@ -7,6 +7,7 @@ import (
 	"unsafe"
 
 	"github.com/goccy/go-json/internal/decoder"
+	"github.com/goccy/go-json/internal/errors"
 	"github.com/goccy/go-json/internal/runtime"
 )
 
@@ -72,7 +73,7 @@ func validateEndBuf(src []byte, cursor int64) error {
 		case nul:
 			return nil
 		}
-		return errSyntax(
+		return errors.ErrSyntax(
 			fmt.Sprintf("invalid character '%c' after top-level value", src[cursor]),
 			cursor+1,
 		)

error.go

@@ -37,13 +37,3 @@ type UnmarshalTypeError = errors.UnmarshalTypeError
 type UnsupportedTypeError = errors.UnsupportedTypeError
 
 type UnsupportedValueError = errors.UnsupportedValueError
-
-var (
-	errExceededMaxDepth      = errors.ErrExceededMaxDepth
-	errNotAtBeginningOfValue = errors.ErrNotAtBeginningOfValue
-	errUnexpectedEndOfJSON   = errors.ErrUnexpectedEndOfJSON
-	errExpected              = errors.ErrExpected
-	errInvalidCharacter      = errors.ErrInvalidCharacter
-	errSyntax                = errors.ErrSyntax
-	errMarshaler             = errors.ErrMarshaler
-)