aTokenAddress
: The address of the aToken to check if listed and get the collateral factor for.RETURN
: Tuple of values (isListed, collateralFactorMantissa, isAnnexd); isListed represents whether the comptroller recognizes this aToken; collateralFactorMantissa, scaled by 1e18, is multiplied by a supply balance to determine how much value can be borrowed. The isAnnexd boolean indicates whether or not suppliers and borrowers are distributed ANN tokens.