go_1_9: skip flaky TestWaitGroupMisuse2

https://github.com/golang/go/issues/20072
https://hydra.nixos.org/build/64351217/nixlog/1

Changed files
+21
pkgs
development
+1
pkgs/development/compilers/go/1.9.nix
···
./creds-test.patch
./remove-test-pie-1.9.patch
./go-1.9-skip-flaky-19608.patch
];
postPatch = optionalString stdenv.isDarwin ''
···
./creds-test.patch
./remove-test-pie-1.9.patch
./go-1.9-skip-flaky-19608.patch
+
./go-1.9-skip-flaky-20072.patch
];
postPatch = optionalString stdenv.isDarwin ''
+20
pkgs/development/compilers/go/go-1.9-skip-flaky-20072.patch
···
···
+
diff --git a/src/sync/waitgroup_test.go b/src/sync/waitgroup_test.go
+
index e3e3096..f80d1e2 100644
+
--- a/src/sync/waitgroup_test.go
+
+++ b/src/sync/waitgroup_test.go
+
@@ -6,6 +6,7 @@ package sync_test
+
+
import (
+
"internal/race"
+
+ "internal/testenv"
+
"runtime"
+
. "sync"
+
"sync/atomic"
+
@@ -73,6 +74,7 @@ func TestWaitGroupMisuse2(t *testing.T) {
+
if runtime.NumCPU() <= 4 {
+
t.Skip("NumCPU<=4, skipping: this test requires parallelism")
+
}
+
+ testenv.SkipFlaky(t, 20072)
+
defer func() {
+
err := recover()
+
if err != "sync: negative WaitGroup counter" &&