Suggestion

(-- block comment --)

Comment out a block of code:

(--
 if answer = 42
 print answer
--)

Re-enable a previously commented-out block:

--(--
 if answer = 42
 print answer
--)

Comment out part of a line of code:

print (foo, (-- bar --), baz)

Comment out a tuple's values (for some reason):

print(--foo, bar, baz--)

Some think it's a bad idea.