Try to find misuses of textui.Progress

 - Add a runtime-check to Progress to notice if we deadlocked or
   forgot to call .Done().

 - Add a runtime-check to Progress.Done() to panic if .Set() was never
   called (instead of the old behavior of deadlocking).

 - grep: Use `defer` when possible, to help remember to call .Done().

 - grep: Always either call .Set() right away, or right before calling
   .Done().

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/streamio/runescanner.go b/lib/streamio/runescanner.go
index 203439f..1206522 100644
--- a/lib/streamio/runescanner.go
+++ b/lib/streamio/runescanner.go
@@ -103,6 +103,7 @@ func (rs *runeScanner) UnreadRune() error {
 
 // ReadRune implements io.Closer.
 func (rs *runeScanner) Close() error {
+	rs.progressWriter.Set(rs.progress)
 	rs.progressWriter.Done()
 	return rs.closer.Close()
 }