[m-dev.] record syntax

[Michael Day]

> 	:- type abstract(T).
> 	:- func field_a(abstract(T)) = int.
> 	:- func field_b(abstract(T)) = int.
> 	:- func field_c(abstract(T)) = int.
> 	:- func 'field_a:='(abstract(T), int) = int.
> 	:- func 'field_b:='(abstract(T), int) = int.
> 	:- func 'field_c:='(abstract(T), int) = int.

How come the 'field_blah:=' functions return int rather than abstract(T)?
And what is the mode of these functions?

Michael

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