nested ifs' in csh dont work?

[Grant Collins]

Howdy Netlanders.  Is csh supposed to interpret nested if's correctly or
not?  Most texts seem to indicate that nested if's will work, but the
following test script (under SunOS 4.0.3) appears to indicate otherwise:

#!/bin/csh -f
set a = 2
set b = 2

if($a == 1) then
   if($b == 1) then
      echo a=1,b=1
   else
      echo a=1,b!=1
   endif
else
   echo ignores from here
   if($b == 1) then
      echo a!=1,b=1
   else
      echo a!=1,b!=1
   endif
   echo all the way to endif above
endif
echo end of script.


Output from this script is:
a=1,b!=1
all the way to endif above
end of script.

It appears that the inner else's and endif's are terminating the outer if.
Is this a feature or a bug, or have I just missed something fundamental?