fix: ensure all backends implement Backend

backend.go

@@ -22,6 +22,8 @@ type Backend interface {
 // Backend to write in file-like objects
 //
 
+var _ Backend = &FileBackend{}
+
 // FileBackend is a backend that writes to a file.
 type FileBackend struct {
 	formatter Formatter
@@ -130,6 +132,8 @@ func (b *FileBackend) Close() error {
 // Noop Backend
 //
 
+var _ Backend = &NoopBackend{}
+
 // NoopBackend does nothing and discards all log entries without writing them anywhere.
 type NoopBackend struct{}
 
@@ -144,7 +148,7 @@ func (*NoopBackend) Write(_ *Record) error {
 }
 
 // SetFormatter is a noop.
-func (*NoopBackend) SetFormatter(_ *Formatter) {}
+func (*NoopBackend) SetFormatter(_ Formatter) {}
 
 // SetLevel is a noop.
 func (*NoopBackend) SetLevel(_ Level) {}

backend_syslog_linux.go

@@ -16,6 +16,8 @@ var errUnknownFacility = errors.New("unknown facility")
 // Syslog Backend
 //
 
+var _ Backend = &SyslogBackend{}
+
 // SyslogBackend writes the logs to a syslog system.
 type SyslogBackend struct {
 	w         *syslog.Writer