Implement override checking

test/compilationTests/MultiSigWallet/MultiSigWalletWithDailyLimit.sol

@@ -40,6 +40,7 @@ contract MultiSigWalletWithDailyLimit is MultiSigWallet {
     /// @param transactionId Transaction ID.
     function executeTransaction(uint transactionId)
         public
+        override
         notExecuted(transactionId)
     {
         Transaction storage tx = transactions[transactionId];

test/compilationTests/corion/premium.sol

@@ -12,7 +12,7 @@ contract thirdPartyPContractAbstract {
 contract ptokenDB is tokenDB {}
 
 contract premium is module, safeMath {
-    function replaceModule(address payable addr) external returns (bool success) {
+    function replaceModule(address payable addr) external override returns (bool success) {
         require( super.isModuleHandler(msg.sender) );
         require( db.replaceOwner(addr) );
         super._replaceModule(addr);

test/compilationTests/corion/provider.sol

@@ -9,14 +9,14 @@ contract provider is module, safeMath, announcementTypes {
     /*
         module callbacks
     */
-    function connectModule() external returns (bool success) {
+    function connectModule() external override returns (bool success) {
         require( super.isModuleHandler(msg.sender) );
         super._connectModule();
         (bool _success, uint256 currentSchellingRound) = moduleHandler(moduleHandlerAddress).getCurrentSchellingRoundID();
         require( _success );
         return true;
     }
-    function transferEvent(address payable from, address payable to, uint256 value) external returns (bool success) {
+    function transferEvent(address payable from, address payable to, uint256 value) external override returns (bool success) {
         /*
             Transaction completed. This function is only available for the modulehandler.
             It should be checked if the sender or the acceptor does not connect to the provider or it is not a provider itself if so than the change should be recorded.
@@ -31,7 +31,7 @@ contract provider is module, safeMath, announcementTypes {
         transferEvent_(to, value, false);
         return true;
     }
-    function newSchellingRoundEvent(uint256 roundID, uint256 reward) external returns (bool success) {
+    function newSchellingRoundEvent(uint256 roundID, uint256 reward) external override returns (bool success) {
         /*
             New schelling round. This function is only available for the moduleHandler.
             We are recording the new schelling round and we are storing the whole current quantity of the tokens.

test/compilationTests/corion/publisher.sol

@@ -9,7 +9,7 @@ contract publisher is announcementTypes, module, safeMath {
     /*
         module callbacks
     */
-    function transferEvent(address payable from, address payable to, uint256 value) external returns (bool success) {
+    function transferEvent(address payable from, address payable to, uint256 value) external override returns (bool success) {
         /*
             Transaction completed. This function is available only for moduleHandler
             If a transaction is carried out from or to an address which participated in the objection of an announcement, its objection purport is automatically set

test/compilationTests/corion/schelling.sol

@@ -134,13 +134,13 @@ contract schelling is module, announcementTypes, schellingVars {
     /*
         module callbacks
     */
-    function replaceModule(address payable addr) external returns (bool) {
+    function replaceModule(address payable addr) external override returns (bool) {
         require( super.isModuleHandler(msg.sender) );
         require( db.replaceOwner(addr) );
         super._replaceModule(addr);
         return true;
     }
-    function transferEvent(address payable from, address payable to, uint256 value) external returns (bool) {
+    function transferEvent(address payable from, address payable to, uint256 value) external override returns (bool) {
         /*
             Transaction completed. This function can be called only by the ModuleHandler.
             If this contract is the receiver, the amount will be added to the prize pool of the current round.

test/compilationTests/corion/token.sol

@@ -15,7 +15,7 @@ contract token is safeMath, module, announcementTypes {
     /*
         module callbacks
     */
-    function replaceModule(address payable addr) external returns (bool success) {
+    function replaceModule(address payable addr) external override returns (bool success) {
         require( super.isModuleHandler(msg.sender) );
         require( db.replaceOwner(addr) );
         super._replaceModule(addr);

test/compilationTests/gnosis/Events/CategoricalEvent.sol

@@ -28,6 +28,7 @@ contract CategoricalEvent is Event {
     /// @return Sender's winnings
     function redeemWinnings()
         public
+        override
         returns (uint winnings)
     {
         // Winning outcome has to be set
@@ -45,6 +46,7 @@ contract CategoricalEvent is Event {
     /// @return Event hash
     function getEventHash()
         public
+        override
         view
         returns (bytes32)
     {

test/compilationTests/gnosis/Events/ScalarEvent.sol

@@ -47,6 +47,7 @@ contract ScalarEvent is Event {
     /// @return Sender's winnings
     function redeemWinnings()
         public
+        override
         returns (uint winnings)
     {
         // Winning outcome has to be set
@@ -79,6 +80,7 @@ contract ScalarEvent is Event {
     /// @return Event hash
     function getEventHash()
         public
+        override
         view
         returns (bytes32)
     {

test/compilationTests/gnosis/MarketMakers/LMSRMarketMaker.sol

@@ -24,6 +24,7 @@ contract LMSRMarketMaker is MarketMaker {
     /// @return Cost
     function calcCost(Market market, uint8 outcomeTokenIndex, uint outcomeTokenCount)
         public
+        override
         view
         returns (uint cost)
     {
@@ -59,6 +60,7 @@ contract LMSRMarketMaker is MarketMaker {
     /// @return Profit
     function calcProfit(Market market, uint8 outcomeTokenIndex, uint outcomeTokenCount)
         public
+        override
         view
         returns (uint profit)
     {
@@ -85,6 +87,7 @@ contract LMSRMarketMaker is MarketMaker {
     /// @return Marginal price of an outcome as a fixed point number
     function calcMarginalPrice(Market market, uint8 outcomeTokenIndex)
         public
+        override
         view
         returns (uint price)
     {

test/compilationTests/gnosis/Markets/StandardMarket.sol

@@ -56,6 +56,7 @@ contract StandardMarket is Market {
     /// @param _funding Funding amount
     function fund(uint _funding)
         public
+        override
         isCreator
         atStage(Stages.MarketCreated)
     {
@@ -70,6 +71,7 @@ contract StandardMarket is Market {
 
     /// @dev Allows market creator to close the markets by transferring all remaining outcome tokens to the creator
     function close()
+        override
         public
         isCreator
         atStage(Stages.MarketFunded)
@@ -85,6 +87,7 @@ contract StandardMarket is Market {
     /// @return Fee amount
     function withdrawFees()
         public
+        override
         isCreator
         returns (uint fees)
     {
@@ -101,6 +104,7 @@ contract StandardMarket is Market {
     /// @return Cost in collateral tokens
     function buy(uint8 outcomeTokenIndex, uint outcomeTokenCount, uint maxCost)
         public
+        override
         atStage(Stages.MarketFunded)
         returns (uint cost)
     {
@@ -131,6 +135,7 @@ contract StandardMarket is Market {
     /// @return Profit in collateral tokens
     function sell(uint8 outcomeTokenIndex, uint outcomeTokenCount, uint minProfit)
         public
+        override
         atStage(Stages.MarketFunded)
         returns (uint profit)
     {
@@ -161,6 +166,7 @@ contract StandardMarket is Market {
     /// @return Cost to short sell outcome in collateral tokens
     function shortSell(uint8 outcomeTokenIndex, uint outcomeTokenCount, uint minProfit)
         public
+        override
         returns (uint cost)
     {
         // Buy all outcomes
@@ -186,6 +192,7 @@ contract StandardMarket is Market {
     /// @return Fee for trade
     function calcMarketFee(uint outcomeTokenCost)
         public
+        override
         view
         returns (uint)
     {

test/compilationTests/gnosis/Markets/StandardMarketFactory.sol

@@ -17,6 +17,7 @@ contract StandardMarketFactory is MarketFactory {
     /// @return Market contract
     function createMarket(Event eventContract, MarketMaker marketMaker, uint24 fee)
         public
+        override
         returns (Market market)
     {
         market = new StandardMarket(msg.sender, eventContract, marketMaker, fee);

test/compilationTests/gnosis/Oracles/CentralizedOracle.sol

@@ -72,6 +72,7 @@ contract CentralizedOracle is Oracle {
     /// @return Is outcome set?
     function isOutcomeSet()
         public
+        override
         view
         returns (bool)
     {
@@ -82,6 +83,7 @@ contract CentralizedOracle is Oracle {
     /// @return Outcome
     function getOutcome()
         public
+        override
         view
         returns (int)
     {

test/compilationTests/gnosis/Oracles/DifficultyOracle.sol

@@ -44,6 +44,7 @@ contract DifficultyOracle is Oracle {
     /// @return Is outcome set?
     function isOutcomeSet()
         public
+        override
         view
         returns (bool)
     {
@@ -55,6 +56,7 @@ contract DifficultyOracle is Oracle {
     /// @return Outcome
     function getOutcome()
         public
+        override
         view
         returns (int)
     {

test/compilationTests/gnosis/Oracles/FutarchyOracle.sol

@@ -151,6 +151,7 @@ contract FutarchyOracle is Oracle {
     /// @return Is outcome set?
     function isOutcomeSet()
         public
+        override
         view
         returns (bool)
     {
@@ -161,6 +162,7 @@ contract FutarchyOracle is Oracle {
     /// @return Outcome
     function getOutcome()
         public
+        override
         view
         returns (int)
     {

test/compilationTests/gnosis/Oracles/MajorityOracle.sol

@@ -70,6 +70,7 @@ contract MajorityOracle is Oracle {
     /// @return Is outcome set?
     function isOutcomeSet()
         public
+        override
         view
         returns (bool)
     {
@@ -81,6 +82,7 @@ contract MajorityOracle is Oracle {
     /// @return Outcome
     function getOutcome()
         public
+        override
         view
         returns (int)
     {

test/compilationTests/gnosis/Oracles/SignedMessageOracle.sol

@@ -84,6 +84,7 @@ contract SignedMessageOracle is Oracle {
     /// @return Is outcome set?
     function isOutcomeSet()
         public
+        override
         view
         returns (bool)
     {
@@ -94,6 +95,7 @@ contract SignedMessageOracle is Oracle {
     /// @return Outcome
     function getOutcome()
         public
+        override
         view
         returns (int)
     {

test/compilationTests/gnosis/Oracles/UltimateOracle.sol

@@ -174,6 +174,7 @@ contract UltimateOracle is Oracle {
     /// @return Is outcome set?
     function isOutcomeSet()
         public
+        override
         view
         returns (bool)
     {
@@ -185,6 +186,7 @@ contract UltimateOracle is Oracle {
     /// @return Outcome
     function getOutcome()
         public
+        override
         view
         returns (int)
     {

test/compilationTests/gnosis/Tokens/StandardToken.sol

@@ -23,6 +23,7 @@ contract StandardToken is Token {
     /// @return Was transfer successful?
     function transfer(address to, uint value)
         public
+        override
         returns (bool)
     {
         if (   !balances[msg.sender].safeToSub(value)
@@ -41,6 +42,7 @@ contract StandardToken is Token {
     /// @return Was transfer successful?
     function transferFrom(address from, address to, uint value)
         public
+        override
         returns (bool)
     {
         if (   !balances[from].safeToSub(value)
@@ -60,6 +62,7 @@ contract StandardToken is Token {
     /// @return Was approval successful?
     function approve(address spender, uint value)
         public
+        override
         returns (bool)
     {
         allowances[msg.sender][spender] = value;
@@ -73,6 +76,7 @@ contract StandardToken is Token {
     /// @return Remaining allowance for spender
     function allowance(address owner, address spender)
         public
+        override
         view
         returns (uint)
     {
@@ -84,6 +88,7 @@ contract StandardToken is Token {
     /// @return Balance of owner
     function balanceOf(address owner)
         public
+        override
         view
         returns (uint)
     {
@@ -94,6 +99,7 @@ contract StandardToken is Token {
     /// @return Total supply
     function totalSupply()
         public
+        override
         view
         returns (uint)
     {