diff --git a/format/format.go b/format/format.go
index ec9c91a..226b892 100644
--- a/format/format.go
+++ b/format/format.go
@@ -261,16 +261,3 @@
 
 	return false
 }
-
-func isNil(a interface{}) bool {
-	if a == nil {
-		return true
-	}
-
-	switch reflect.TypeOf(a).Kind() {
-	case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
-		return reflect.ValueOf(a).IsNil()
-	}
-
-	return false
-}