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// Copyright INRIA
 
a=1;
 
deff('[x]=tata(y)','x=-y,write(%io(2),''enter quit''),pause,x=+20')
 
xx=tata(10);
enter quit
 
Type 'resume' or 'abort' to return to standard level prompt.

quit;
 
if 10+xx<>0 then bugmes();quit;end
 
b=2;
 
deff('[x]=tata(y)',['x=-y'
                 'write(6,''enter return'')'
                 'pause'
                 'x=+20'])
Warning : redefining function : tata                    
 
 
xx=tata(0);
enter return
 
return
 
if 20-xx<>0 then bugmes();quit;end
 
deff('[x]=tata(y)','x=-y,write(6,''type x=resume(0)''),pause')
Warning : redefining function : tata                    
 
 
xx=tata(40);
type x=resume(0)
 
x=resume(0)
 
if xx<>0 then bugmes();quit;end
 
clear x
 
text=['after quit '
      'undefined variable x']
 text  =
 
!after quit            !
!                      !
!undefined variable x  !
 
deff('[x]=toto(n)',['v=100'
                    'write(%io(2),text)'
                    'pause'
                     'x=n'])
 
write(%io(2),'enter abort (after receiving this message:)')
enter abort (after receiving this message:)
 
toto(0);
after quit 
undefined variable x
 
abort