♻️ DRY

errgroup.go

@@ -59,6 +59,18 @@ func (g *Group) error() error {
 	return v.(error)
 }
 
+func (g *Group) setError(err error) {
+	if err == nil {
+		return
+	}
+	g.errOnce.Do(func() {
+		g.err.Store(err)
+		if g.cancel != nil {
+			g.cancel(err)
+		}
+	})
+}
+
 // Wait blocks until all function calls from the Go method have returned, then
 // returns the first non-nil error (if any) from them.
 func (g *Group) Wait() error {
@@ -102,14 +114,7 @@ func (g *Group) Go(f func() error) {
 		//   that prevents the Wait call from being reached.
 		// See #53757, #74275, #74304, #74306.
 
-		if err := f(); err != nil {
-			g.errOnce.Do(func() {
-				g.err.Store(err)
-				if g.cancel != nil {
-					g.cancel(err)
-				}
-			})
-		}
+		g.setError(f())
 	}()
 }
 
@@ -133,15 +138,7 @@ func (g *Group) TryGo(f func() error) bool {
 	g.wg.Add(1)
 	go func() {
 		defer g.done()
-
-		if err := f(); err != nil {
-			g.errOnce.Do(func() {
-				g.err.Store(err)
-				if g.cancel != nil {
-					g.cancel(err)
-				}
-			})
-		}
+		g.setError(f())
 	}()
 	return true
 }