test output 2 0xc4200153d0 ================== WARNING: DATA RACE Write at 0x00c4200153d0 by goroutine 7: race_test.TestRace.func1() race_test.go:13 +0x3b Previous write at 0x00c4200153d0 by goroutine 6: race_test.TestRace() race_test.go:15 +0x136 testing.tRunner() /usr/local/Cellar/go/1.8.3/libexec/src/testing/testing.go:657 +0x107 Goroutine 7 (running) created at: race_test.TestRace() race_test.go:14 +0x125 testing.tRunner() /usr/local/Cellar/go/1.8.3/libexec/src/testing/testing.go:657 +0x107 Goroutine 6 (running) created at: testing.(*T).Run() /usr/local/Cellar/go/1.8.3/libexec/src/testing/testing.go:697 +0x543 testing.runTests.func1() /usr/local/Cellar/go/1.8.3/libexec/src/testing/testing.go:882 +0xaa testing.tRunner() /usr/local/Cellar/go/1.8.3/libexec/src/testing/testing.go:657 +0x107 testing.runTests() /usr/local/Cellar/go/1.8.3/libexec/src/testing/testing.go:888 +0x4e0 testing.(*M).Run() /usr/local/Cellar/go/1.8.3/libexec/src/testing/testing.go:822 +0x1c3 main.main() _test/_testmain.go:52 +0x20f ================== testing.go:610: race detected during execution of test