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> Actually the 'make a field extractor for foo' is a good example of how
> sometimes a little lambda is easier to write and read than a library
> function.
>

Given Lua's indulgence to all those Fortran programmers out
there, what about good old "arithmetic statement functions" for
a lightweight syntax?  In this case:

foo(x) = x.foo

Since it's not anonymous, even I would use it …