[m-rev.] for review: std_util__arg_name

[Peter Schachte]

> Adding std_util__arg_name for retrieving the field name (if any) of a
> functor argument.

Before this becomes part of the language or standard library, I think we
should consider whether or not it is really worth its cost.  Without this, I
believe Mercury executables could strip out field names.  Once it's in, that
becomes much harder, and in some cases impossible.  So is this feature
really worth the executable-size bloat?

-- 
Peter Schachte              Your enemy is never a villain in his own eyes,
schachte at cs.mu.OZ.AU        keep this is mind.
www.cs.mu.oz.au/~schachte/      -- Robert Heinlein 
Phone: +61 3 8344 9166      
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