help beginner "report not available"

Hi Flinders.

I have this problem. I instaled Quartus II 10.0sp1 web edition. I make this VHDL file

LIBRARY ieee ;

USE ieee.std_logic_1164.all ;

ENTITY light IS

PORT ( x1, x2 : IN STD_LOGIC ;

f : OUT STD_LOGIC ) ;

END light ;

ARCHITECTURE LogicFunction OF light IS

BEGIN

f <= (x1 AND NOT x2) OR (NOT x1 AND x2)

END LogicFunction ;

which is regular. I compile it and a get no warnings or errors. Now when I remove the semicolon from line where f is defined compiler reports no error at all. I think that it should report that "; is expected" or something like that. The code with error is:

LIBRARY ieee ;

USE ieee.std_logic_1164.all ;

ENTITY light IS

PORT ( x1, x2 : IN STD_LOGIC ;

f : OUT STD_LOGIC ) ;

END light ;

ARCHITECTURE LogicFunction OF light IS

BEGIN

f <= (x1 AND NOT x2) OR (NOT x1 AND x2)

END LogicFunction ;

Why isn't my compiler working? (the device is MAXII)

And ofcourse Compilation report says data not available.