Змейка - "попытка вызвать функцию как процедуру"

Program Zmeya;
Uses graphabc, events,timers;
 
const
r=4 ;
d=8;
 
type
TDirection = (None, Left, Right, Up, Down);
 
var x,t,y,i,z,xr,yr,prin1,prin2,prin3,prin4,prin5,k,s4et,prin6: integer;
 Direction :TDirection;
 xs,ys,bufx,bufy:array[1..200]of integer;
 
procedure shar3;
 begin
 SetBrushColor(clYellow);
 circle(xs[k],ys[k],r);
 end;
 
procedure Circl;
begin
 SetBrushColor(clBlack);
 circle(x,y,r);
end;
 
procedure rshar ;
 begin
 xr:=Random(WindowWidth) ;
 yr:=Random( WindowHeight);
 end;
 
procedure rshar2;
 begin
 SetBrushColor(clYellow);
 circle(xr,yr,r);
 end;
 
 procedure XP(Key:integer);
 begin
 case Key of
 VK_Left: Direction := Left ;
 VK_Right:Direction := Right ;
 VK_UP: Direction := UP ;
 VK_Down: Direction :=Down ;
 end;
 circle(x,y,r);
 end;
 
procedure pause;
 begin
 for i:=1 to 1 do
 begin
 Circl;
 rshar2;
 ClearWindow;
 rshar2 ;
 prin1:=(xr-x+r)*(xr-x+r)+(yr-y)*(yr-y) ;
 prin2:=(xr-x-r)*(xr-x-r)+(yr-y)*(yr-y) ;
 prin3:=(xr-x)*(xr-x)+(yr-y+r)*(yr-y+r) ;
 prin4:=(xr-x)*(xr-x)+(yr-y-r)*(yr-y-r) ;
 prin5:=R*R;
 if (prin1)<=(prin5) then begin
 rshar ;
 s4et:=s4et+1;
 end;
 
if (prin2)<=(prin5) then begin
 rshar ;
 s4et:=s4et+1;
 end;
 if (prin3)<=(prin5) then begin
 rshar ;
 s4et:=s4et+1;
 end;
 if (prin4)<=(prin5) then begin
 rshar ;
 s4et:=s4et+1;
 end;
 
 case Direction of
 Left: begin x:=x-d; if x<=0 then x:=WindowWidth end;
 Up: begin y:=y-d; if y<=0 then y:=WindowHeight end;
 Right: begin x:=x+d; if x>=WindowWidth then x:=0 end;
 Down: begin y:=y+d; if y>=WindowHeight then y:=0 end;
 end;
 xs[1]:=x;
 ys[1]:=y;
 for k:=1 to s4et do
 begin
 bufx[k]:=xs[k];
 bufy[k]:=ys[k];
 
 end;
 for k:=1 to s4et do
 begin
 xs[k+1]:=bufx[k];
 ys[k+1]:=bufy[k] ;
 end;
 for k:=2 to s4et do
 shar3;
 Circl;
 end;
 end;
 begin
rshar;
s4et:=2;
 
 Direction := None;
 
 x:=WindowWidth div 2;
 y:=WindowHeight div 2;
 OnKeyDown:=XP;
 CreateTimer(150,pause);
 End.