[m-dev.] arg packing of structured values

[Michael Day]

Hi Zoltan,

> My question for you guys is: would this be a useful thing to implement?

It's certainly nice in that it frees up the programmer to structure 
their types in the most convenient way without sacrificing any storage 
efficiency.

> Do you know of any set of types in programs you know of to which
> this optimization is applicable? Or should I try to find such type sets
> by implementing the applicability test for this optimization, and
> getting the compiler to spit out informational messages about
> any types for which the test succeeds?

Having a test to find such types sounds helpful.

Michael

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