[import,module] got biting again :(

[Don]

bearophile wrote:
> Don:
> 
>> Bug 314 is the root cause of every module bug that I know of. Basically 
>> the compiler isn't keeping track of how symbols got imported. So it gets 
>> everything wrong.
> 
> Bug 314 is among my voted bugs since a lot of time. 

Actually it was the most voted bug in D, long before your involvement 
with D!

>Even if bug 314 isn't the only module system bug present, solving it is a good starting point.

> 
> In Comment 28 of bug 314 Christian Kamm has given a kind of partial patch, as requested. Is it good enough?

Still needs work. Especially, we need a comprehensive set of test cases.