==================
WARNING: DATA RACE
Read at 0x00c000018398 by goroutine 8:
  example.com/cap/race.TestACounterIsShared.func1()
      /src/cap/race/race_test.go:13 +0x7b

Previous write at 0x00c000018398 by goroutine 9:
  example.com/cap/race.TestACounterIsShared.func1()
      /src/cap/race/race_test.go:13 +0x8d

Goroutine 8 (running) created at:
  example.com/cap/race.TestACounterIsShared()
      /src/cap/race/race_test.go:13 +0x78
  testing.tRunner()
      /usr/lib/go/src/testing/testing.go:2193 +0x21c
  testing.(*T).Run.gowrap1()
      /usr/lib/go/src/testing/testing.go:2258 +0x38

Goroutine 9 (finished) created at:
  example.com/cap/race.TestACounterIsShared()
      /src/cap/race/race_test.go:13 +0x78
  testing.tRunner()
      /usr/lib/go/src/testing/testing.go:2193 +0x21c
  testing.(*T).Run.gowrap1()
      /usr/lib/go/src/testing/testing.go:2258 +0x38
==================
--- FAIL: TestACounterIsShared (0.00s)
    testing.go:1865: race detected during execution of test
FAIL
FAIL	example.com/cap/race	0.008s
FAIL