[project @ 2005-07-22 14:00:34 by simonpj]

[project @ 2005-07-22 14:00:34 by simonpj]
MERGE TO STABLE

Fix a long-standing bug in dependency tracking.
If you have

	import M( x )

then you must recompile if M's export list changes, because it might
no longer export x.  Until now we have only done that if the import was

	import M

I can't think why this bug has lasted so long.  Thanks to Ian Lynagh
for pointing it out.