Add support for UncheckedStatement blocks (#712)

Author: cgewecke

lib/parse.js

@@ -239,6 +239,11 @@ parse.TryStatement = function(contract, expression) {
   }
 };
 
+parse.UncheckedStatement = function(contract, expression) {
+  parse[expression.block.type] &&
+  parse[expression.block.type](contract, expression.block);
+}
+
 parse.UsingStatement = function (contract, expression) {
   parse[expression.for.type] &&
   parse[expression.for.type](contract, expression.for);

test/integration/projects/solc-8/contracts/Contract_solc8.sol

@@ -17,4 +17,14 @@ contract ContractA {
 
         someAddress = _add;
     }
+
+    function checkSomething() external {
+      uint a = 5;
+
+      unchecked {
+        a++;
+      }
+
+      unchecked {}
+    }
 }

test/integration/projects/solc-8/test/test_solc8.js

@@ -10,4 +10,8 @@ contract("contracta", function(accounts) {
   it('a:throwError', async function(){
     await a.throwError(a.address);
   });
+
+  it('a:checkSomething', async function(){
+    await a.checkSomething();
+  })
 });

test/units/hardhat/standard.js

@@ -335,7 +335,7 @@ describe('Hardhat Plugin: standard use cases', function() {
     const expectedLine = [
       {
         file: mock.pathToContract(hardhatConfig, 'Contract_solc8.sol'),
-        pct: 75
+        pct: 87.5
       },
     ];