fixed error handling and docs

feed.go

@@ -1,10 +1,12 @@
 package gubgub
 
-import "iter"
+import (
+	"iter"
+)
 
-// Feed allows the usage of for/range to consume future published messages.
+// Feed allows the usage of for/range loop to consume future published messages.
 // The supporting subscriber will eventually be discarded after you exit the for loop.
-func Feed[T any](t Subscribable[T], buffered bool) iter.Seq[T] {
+func Feed[T any](t Subscribable[T], buffered bool) (iter.Seq[T], error) {
 	feed := make(chan T)               // closed by the subscriber
 	unsubscribe := make(chan struct{}) // closed by the iterator
 
@@ -22,7 +24,10 @@ func Feed[T any](t Subscribable[T], buffered bool) iter.Seq[T] {
 		subscriber = Buffered(subscriber)
 	}
 
-	t.Subscribe(subscriber)
+	err := t.Subscribe(subscriber)
+	if err != nil {
+		return nil, err
+	}
 
 	// Iterator
 	return func(yield func(T) bool) {
@@ -33,5 +38,5 @@ func Feed[T any](t Subscribable[T], buffered bool) iter.Seq[T] {
 				return
 			}
 		}
-	}
+	}, nil
 }