function signature and dispatch behavior

[pafnucy]

At the moment, function return value signature isn't checked and serves as semantic annotation for reader, function with declared value of 1 or 2 might return 4. Also there is a less important issue with function dispatch. In example below, f1 for var ints doesn't get called with var x as argument.

var int: x;
set of int: DAY = 1..7;
constraint x in {5, 6};

function array[1..2] of 1..2: f1(int: n) = [i | i in 1..n];
function array[1..2] of var 1..2: f1(var int: n) = [1, 2, 3, 4];
function set of DAY: f2() = {10};
function set of 1..2: f3() = {10};

output[show(f1(3)) ++ "\n" ++ show(f1(x)) ++ "\n" ++ show(f2()) ++ "\n" ++ show(f3())];
solve satisfy;

Code runs, returning

[1, 2, 3]
[1, 2, 3, 4, 5, 6]
10..10
10..10

I think the code should rather fail and in case of

function array[int] of int: f1(int: n) = [i | i in 1..n];
function array[int] of var int: f1(var int: n) = [1, 2, 3, 4];

first two lines of output should be

[1, 2, 3]
[1, 2, 3, 4]

[guidotack]

Thanks, this should be mostly fixed now in the develop branch.