make sure visitors satisfy the EntryVisitor interface

Author: steiler

pkg/tree/visitor_blame_config.go

@@ -15,6 +15,8 @@ type BlameConfigVisitor struct {
 	// skipUp          bool
 }
 
+var _ EntryVisitor = (*BlameConfigVisitor)(nil)
+
 func NewBlameConfigVisitor(includeDefaults bool) *BlameConfigVisitor {
 	return &BlameConfigVisitor{
 		stack:           []*sdcpb.BlameTreeElement{},

pkg/tree/visitor_mark_owner_delete.go

@@ -8,6 +8,8 @@ type MarkOwnerDeleteVisitor struct {
 	leafVariantsMatched LeafVariantSlice
 }
 
+var _ EntryVisitor = (*MarkOwnerDeleteVisitor)(nil)
+
 func NewMarkOwnerDeleteVisitor(owner string, onlyIntended bool) *MarkOwnerDeleteVisitor {
 	return &MarkOwnerDeleteVisitor{
 		owner:               owner,