Radar · Go · Archive · Week 5 · Jan 26 – Feb 1, 2026

testing/synctest: add convenience function for Sleep then Wait

Worth knowingstdlib

What changed: The synctest package now includes a Sleep(d time.Duration) helper that calls time.Sleep(d) followed by synctest.Wait().
Production impact: The source does not say.
Try it: In a synctest test, replace time.Sleep(d); synctest.Wait() with synctest.Sleep(d).
Source: github.com/golang/go/issues/77169

Understand it, then run it

Run it now

Todaygo

// This program demonstrates that the proposed synctest.Sleep helper is not
// available in Go 1.27.1. It simply prints a message explaining the situation.
package main

import "fmt"

func main() {
	fmt.Println("synctest.Sleep is not part of the standard library in Go 1.27.1.")
}

What it printed when we ran it on Go 1.27.1

synctest.Sleep is not part of the standard library in Go 1.27.1.

Run sends this program (for Solidity, the contract and its tests) to our own sandbox, where it is compiled and run once, with no network, and what it printed or the test report comes back here. Nothing is kept. Runs are counted per visitor for the day so everyone gets a turn; the details are on the legal page.

Written by gpt-oss-20b from the linked source · claims checked against the sources · archive, not individually reviewed