[mercury-users] !foo

[Ralph Becket]

Michael Day, Monday, 24 March 2003:
> 
> Idea:
> 
> :- pred foo(int, string, !io).
> :- mode foo(in, out, !io).

As you point out, this rather falls down at the mode declaration.

My feeling is that state variable syntax should be recognised as just a
convenient shorthand and we should not try to pretend it has any direct
declarative reading.  That is, we should leave it out of the pred and
mode declarations.

- Ralph
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