[m-dev.] For review: improve undefined pred/symbol error message

[Fergus Henderson]

On 22-Sep-1998, Thomas Charles CONWAY <conway at cs.mu.OZ.AU> wrote:
> Keep track of which modules have been imported directly by the current module
> so that later in type checking, if an explicitly qualified name is undefined,
> we can issue an error message that gives a hint if the module has not been
> imported.

That looks fine now.

I suppose it may as well go in this release.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
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