Submitted by WatchPug
CTokenInterfaces.sol#L355-L358
repayBorrowBehalf() for native cToken (CEther) will return nothing, while the current CEthInterface interface defines the returns as (uint256).
As a result, ether.repayBorrowBehalf() will always revert
CompoundHandler.sol#L117-L118
Ref:
chase-manning (Backd) confirmed
