K 10
svn:author
V 4
nyan
K 8
svn:date
V 27
2019-01-27T13:58:06.573934Z
K 7
svn:log
V 224
MFC: r342964

  Sync with OpenBSD.

  bc.y: Rev 1.50
  - write parse errors to stderr, prompted by Martijn Dekker
  - we're only interactive if stdout en stderr are a tty as well as stdin

PR:		234430
Obtained from:	OpenBSD

END