Update examples

Author: devlights

examples/basic/syncs/use_oncefunc.go

@@ -33,8 +33,8 @@ func UseOnceFunc() error {
 		i := i
 		go func() {
 			f()
-			done <- true
 			output.Stderrf("[done]", "goroutine-%d\n", i)
+			done <- true
 		}()
 	}
 

examples/basic/syncs/use_oncevalue.go

@@ -35,8 +35,8 @@ func UseOnceValue() error {
 		i := i
 		go func() {
 			result := f()
-			done <- true
 			output.Stderrf("[done]", "result=%d\tgoroutine-%d\n", result, i)
+			done <- true
 		}()
 	}
 

examples/basic/syncs/use_oncevalues.go

@@ -29,8 +29,8 @@ func UseOnceValues() error {
 		i := i
 		go func() {
 			result, err := f()
-			done <- true
 			output.Stderrf("[done]", "result=%d\terr=%v\tgoroutine-%d\n", result, err, i)
+			done <- true
 		}()
 	}