Mouse.Target Local Script Giving Expected Near Error?

The script is not working, and is giving me this error Workspace.Player1.LocalScript:8: 'do' expected near 'game'

player = game.Players.LocalPlayer
character = game.Players.LocalPlayer.Character
gun = character:findFirstChild("Rifle")
mouse = player:GetMouse()

mouse.Button1Down:connect(function()
function getModel(raw)
for _,__ in next game.Workspace:children'' do
if raw:IsDescendantOf(__) then
return __;
end;
end;
return raw;
end;

local success,hum = pcall(function() return getModel(mouse.Target).Humanoid end);
hum.Health = hum.Health -15

end)

children requires (), not ''. Also, children is deprecated, use GetChildren() instead.