bitwise short-circuiting

[Arthur David Olson]

We let lint worry about such stuff here at elsie:

	Script started on Mon Feb 22 13:57:52 1988
	$ cat try.c
	main() { return 0 & func(); }
	func() { return 1; }
	$ lint -h try.c
	try.c:
	try.c(1): warning: superfluous operation on zero
	...

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