Everyone here in the previous comments are clueless, bitcoin cash and bitcoin use the exact same private keys so if you sent bitcoin cash to a bitcoin address the owner of that bitcoin address can claim it on a bitcoin cash wallet by loading up their private key.
In other words you lose nothing.
LOL..Receiver can somehow claim it..
on other word you lost it.
What he meant is that the transaction will go through and the coins are not lost in Nirvana. Of course, if you send coins to an address that you don't own, they are gone - no matter if it is a BTC or a BCH address.