f          *os.File
	sync.Mutex // for f.Write
}

// initCoverProfile initializes the test coverage profile.
// It must be run before any calls to mergeCoverProfile or closeCoverProfile.
// Using this function clears the profile in case it existed from a previous run,
// or in case it doesn't exist and the test is going to fail to create it (or not run).
func initCoverProfile() {
	if testCoverProfile == "" || testC {
		return
	}

					buf.WriteString("\n")
				}

				base.Errorf("cannot write test binary %s for multiple packages:\n%s", testBinary, buf.String())
			}
		}

		base.ExitIfErrors()
	}

	initCoverProfile()
	defer closeCoverProfile()

	// If a test timeout is finite, set our kill timeout
	// to that timeout plus one minute. This is a backup alarm in case