Bug 29200

	Syntax errors in /boot/device.hints cause rejection of all
subsequent lines rather than rejection on the one offending line.
Thus minor typographical errors can disable the system or make it
highly unusable and difficult to recover.

How-To-Repeat: 
	Modify a single line of /boot/device.hints to include a small
syntax error: hint.ed.0.port="0x280";  The trailing semicolon is
invalid.  Any subsequent lines will be ignored as a result.  By
placing this line before something non-critical, such as a parallel
port, you can demonstrate that the hints are no longer recognized.

With the error:
ppc0: <Standard parallel printer port> at port 0x3bc-0x3bf irq 5,7 on isa0

Without:

ppc0: <Parallel port> at port 0x3bc-0x3c3 irq 7 on isa0

If this experiment is repeated with the error preceding the system
console, it will not be initialized, and login is not possible on the
console.

The error appears to be in /boot/support.4th, but I have long since
forgotten my forth.