"os"
	"sync/atomic"
)

// CoverBlock records the coverage data for a single basic block.
// The fields are 1-indexed, as in an editor: The opening line of
// the file is number 1, for example. Columns are measured
// in bytes.
// NOTE: This struct is internal to the testing infrastructure and may change.
// It is not covered (yet) by the Go 1 compatibility guidelines.
type CoverBlock struct {