1 files changed, 4 insertions, 1 deletions
diff --git a/internal/mapr/logformat/custom1.go b/internal/mapr/logformat/custom1.go
index 7229f3e..a159328 100644
--- a/internal/mapr/logformat/custom1.go
+++ b/internal/mapr/logformat/custom1.go
@@ -2,15 +2,18 @@ package logformat
 
 import "errors"
 
+// ErrCustom1NotImplemented indicates custom1 parser is only a template.
 var ErrCustom1NotImplemented error = errors.New("custom1 log format is not implemented")
 
 // Template for creating a custom log format.
 type custom1Parser struct{}
 
+var _ Parser = (*custom1Parser)(nil)
+
 func newCustom1Parser(hostname, timeZoneName string, timeZoneOffset int) (*custom1Parser, error) {
 	return &custom1Parser{}, ErrCustom1NotImplemented
 }
 
-func (p *custom1Parser) MakeFields(maprLine string) (map[string]string, error) {
+func (p *custom1Parser) MakeFields(maprLine, _ string) (map[string]string, error) {
 	return nil, ErrCustom1NotImplemented
 }