[mercury-users] uniqueness

[Michael Day]

Why does this give a mode error which must be removed by performing an
explicit copy:

:- pred pack(a, b, c, structure).
:- mode pack(di, di, di, uo) is det.

pack(A, B, C, s(A, B, C)).

Is this just running into the compiler's current limitations with unique
modes again?

Michael

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