fix: Make _pool public of AToken and DebtToken

contracts/protocol/tokenization/AToken.sol

@@ -28,12 +28,12 @@ contract AToken is VersionedInitializable, IncentivizedERC20, IAToken {
 
   uint256 public constant ATOKEN_REVISION = 0x1;
 
-  IPool internal immutable _pool;
+  IPool public immutable POOL;
   address internal _treasury;
   address internal _underlyingAsset;
 
   modifier onlyPool() {
-    require(_msgSender() == address(_pool), Errors.CT_CALLER_MUST_BE_POOL);
+    require(_msgSender() == address(POOL), Errors.CT_CALLER_MUST_BE_POOL);
     _;
   }
 
@@ -45,7 +45,7 @@ contract AToken is VersionedInitializable, IncentivizedERC20, IAToken {
   constructor(IPool pool)
     IncentivizedERC20(pool.getAddressesProvider(), 'ATOKEN_IMPL', 'ATOKEN_IMPL', 0)
   {
-    _pool = pool;
+    POOL = pool;
   }
 
   /// @inheritdoc IInitializableAToken
@@ -70,7 +70,7 @@ contract AToken is VersionedInitializable, IncentivizedERC20, IAToken {
 
     emit Initialized(
       underlyingAsset,
-      address(_pool),
+      address(POOL),
       treasury,
       address(incentivesController),
       aTokenDecimals,
@@ -161,7 +161,7 @@ contract AToken is VersionedInitializable, IncentivizedERC20, IAToken {
     override(IncentivizedERC20, IERC20)
     returns (uint256)
   {
-    return super.balanceOf(user).rayMul(_pool.getReserveNormalizedIncome(_underlyingAsset));
+    return super.balanceOf(user).rayMul(POOL.getReserveNormalizedIncome(_underlyingAsset));
   }
 
   /// @inheritdoc IScaledBalanceToken
@@ -187,7 +187,7 @@ contract AToken is VersionedInitializable, IncentivizedERC20, IAToken {
       return 0;
     }
 
-    return currentSupplyScaled.rayMul(_pool.getReserveNormalizedIncome(_underlyingAsset));
+    return currentSupplyScaled.rayMul(POOL.getReserveNormalizedIncome(_underlyingAsset));
   }
 
   /// @inheritdoc IScaledBalanceToken
@@ -213,14 +213,6 @@ contract AToken is VersionedInitializable, IncentivizedERC20, IAToken {
     return _underlyingAsset;
   }
 
-  /**
-   * @notice Returns the address of the pool where this aToken is used
-   * @return Address of the pool
-   **/
-  function POOL() external view returns (IPool) {
-    return _pool;
-  }
-
   /// @inheritdoc IAToken
   function transferUnderlyingTo(address target, uint256 amount) external override onlyPool {
     IERC20(_underlyingAsset).safeTransfer(target, amount);
@@ -271,15 +263,15 @@ contract AToken is VersionedInitializable, IncentivizedERC20, IAToken {
   ) internal {
     address underlyingAsset = _underlyingAsset;
 
-    uint256 index = _pool.getReserveNormalizedIncome(underlyingAsset);
+    uint256 index = POOL.getReserveNormalizedIncome(underlyingAsset);
 
     uint256 fromBalanceBefore = super.balanceOf(from).rayMul(index);
     uint256 toBalanceBefore = super.balanceOf(to).rayMul(index);
 
     super._transfer(from, to, Helpers.castUint128(amount.rayDiv(index)));
 
     if (validate) {
-      _pool.finalizeTransfer(underlyingAsset, from, to, amount, fromBalanceBefore, toBalanceBefore);
+      POOL.finalizeTransfer(underlyingAsset, from, to, amount, fromBalanceBefore, toBalanceBefore);
     }
 
     emit BalanceTransfer(from, to, amount, index);

contracts/protocol/tokenization/StableDebtToken.sol

@@ -53,7 +53,7 @@ contract StableDebtToken is IStableDebtToken, DebtTokenBase {
 
     emit Initialized(
       underlyingAsset,
-      address(_pool),
+      address(POOL),
       address(incentivesController),
       debtTokenDecimals,
       debtTokenName,

contracts/protocol/tokenization/VariableDebtToken.sol

@@ -48,7 +48,7 @@ contract VariableDebtToken is DebtTokenBase, IVariableDebtToken {
 
     emit Initialized(
       underlyingAsset,
-      address(_pool),
+      address(POOL),
       address(incentivesController),
       debtTokenDecimals,
       debtTokenName,
@@ -70,7 +70,7 @@ contract VariableDebtToken is DebtTokenBase, IVariableDebtToken {
       return 0;
     }
 
-    return scaledBalance.rayMul(_pool.getReserveNormalizedVariableDebt(_underlyingAsset));
+    return scaledBalance.rayMul(POOL.getReserveNormalizedVariableDebt(_underlyingAsset));
   }
 
   /// @inheritdoc IVariableDebtToken
@@ -135,7 +135,7 @@ contract VariableDebtToken is DebtTokenBase, IVariableDebtToken {
 
   /// @inheritdoc IERC20
   function totalSupply() public view virtual override returns (uint256) {
-    return super.totalSupply().rayMul(_pool.getReserveNormalizedVariableDebt(_underlyingAsset));
+    return super.totalSupply().rayMul(POOL.getReserveNormalizedVariableDebt(_underlyingAsset));
   }
 
   /// @inheritdoc IScaledBalanceToken

contracts/protocol/tokenization/base/DebtTokenBase.sol

@@ -23,20 +23,20 @@ abstract contract DebtTokenBase is
     keccak256(
       'DelegationWithSig(address delegator,address delegatee,uint256 value,uint256 nonce,uint256 deadline)'
     );
-  IPool internal immutable _pool;
+  IPool public immutable POOL;
 
   /**
    * @dev Only pool can call functions marked by this modifier
    **/
   modifier onlyPool() {
-    require(_msgSender() == address(_pool), Errors.CT_CALLER_MUST_BE_POOL);
+    require(_msgSender() == address(POOL), Errors.CT_CALLER_MUST_BE_POOL);
     _;
   }
 
   constructor(IPool pool)
     IncentivizedERC20(pool.getAddressesProvider(), 'DEBT_TOKEN_IMPL', 'DEBT_TOKEN_IMPL', 0)
   {
-    _pool = pool;
+    POOL = pool;
   }
 
   /// @inheritdoc ICreditDelegationToken
@@ -105,14 +105,6 @@ abstract contract DebtTokenBase is
    **/
   function _getUnderlyingAssetAddress() internal view virtual returns (address);
 
-  /**
-   * @notice Returns the address of the pool where this debtToken is used
-   * @return The address of the Pool
-   **/
-  function POOL() external view returns (IPool) {
-    return _pool;
-  }
-
   /**
    * @dev Being non transferrable, the debt token does not implement any of the
    * standard ERC20 functions for transfer and allowance.