[m-rev.] for review: rewrite of Modes chapter

[David Overton]

This looks good to me.  I agree with Fergus's comments and have only one
other minor suggestion.

> -
> -An @dfn{instantiatedness tree} is an assignment
> -of an @dfn{instantiatedness} --- either @dfn{free} or @dfn{bound} ---
> -to each or-node of a type tree,
> -with the constraint that all descendants of a free node must be free.
> +In Mercury, the state of instantiation, or @dfn{inst}, of a variable
> +is a description of the terms that the variable may be bound to.
> +The simplest insts are @samp{free}, which describes any distinct variable
> +(that is, any free variable not aliased to another variable),
> +and @samp{ground} which describes any ground term;
> +more complex insts are also possible.

You may want to add "and are described later" or something like that.



David
-- 
David Overton                  Uni of Melbourne     +61 3 8344 1354
dmo at cs.mu.oz.au                Monash Uni (Clayton) +61 3 9905 5779
http://www.cs.mu.oz.au/~dmo    Mobile Phone         +61 4 0337 4393
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