K 10
svn:author
V 4
nyan
K 8
svn:date
V 27
2019-01-12T12:35:02.293169Z
K 7
svn:log
V 220
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
MFC after:	1 week

END