fixup! satisfy ST1012

Author: vbauerster

_examples/progressAsWriter/main.go

@@ -26,7 +26,7 @@ func main() {
 		for {
 			select {
 			case <-done:
-				// after done, underlying io.Writer returns mpb.DoneError
+				// after done, underlying io.Writer returns mpb.ErrDone
 				// so following isn't printed
 				log.Println("all done")
 				return

progress.go

@@ -149,7 +149,7 @@ func (p *Progress) MustAdd(total int64, filler BarFiller, options ...BarOption)
 // Add creates a bar which renders itself by provided BarFiller.
 // If `total <= 0` triggering complete event by increment methods
 // is disabled. If called after `(*Progress).Wait()` then
-// `(nil, DoneError)` is returned.
+// `(nil, ErrDone)` is returned.
 func (p *Progress) Add(total int64, filler BarFiller, options ...BarOption) (*Bar, error) {
 	if filler == nil {
 		filler = NopStyle().Build()
@@ -205,8 +205,7 @@ func (p *Progress) UpdateBarPriority(b *Bar, priority int, lazy bool) {
 // Write is implementation of io.Writer.
 // Writing to `*Progress` will print lines above a running bar.
 // Writes aren't flushed immediately, but at next refresh cycle.
-// If called after `(*Progress).Wait()` then `(0, DoneError)`
-// is returned.
+// If called after `(*Progress).Wait()` then `(0, ErrDone)` is returned.
 func (p *Progress) Write(b []byte) (int, error) {
 	type result struct {
 		n   int