Example.zig

fn foo(array: []const i32, other: []const i32)bool {
    warn("TEST");
    return true;
}

fn other(array: []const u8, other: []const u8)bool {
    warn("TEST");
    return true;
}

fn k(comptime T: type, func: fn(array: T, other: T)bool, array: T) void {
    warn("FOO");
    _ = func(array, array);
}

test "Test" {
    var array = []i32 { 0, 1, 2};
    k([]i32, foo, array[0..]);
    var str = "BOOOO";
    // This line won't compile
    k([]u8, other, str);
}

You can't cast a [5]i32 to []i32. You have to slice it, like you do on line 18. You can only implicitly cast [5]i32 to []const i32.