Parse TryStatements and catchClauses (#522)

Author: cgewecke

lib/parse.js

@@ -171,6 +171,17 @@ parse.ReturnStatement = function(contract, expression) {
   parse[subExpression.argument.type](contract, expression.argument);
 };*/
 
+parse.TryStatement = function(contract, expression) {
+  register.statement(contract, expression);
+  parse[expression.body.type] &&
+  parse[expression.body.type](contract, expression.body);
+
+  for (let x = 0; x < expression.catchClauses.length; x++) {
+    parse[expression.catchClauses[x].body.type] &&
+    parse[expression.catchClauses[x].body.type](contract, expression.catchClauses[x].body);
+  }
+};
+
 parse.UsingStatement = function (contract, expression) {
   parse[expression.for.type] &&
   parse[expression.for.type](contract, expression.for);

test/integration/projects/solc-6/contracts/ContractA.sol

@@ -43,7 +43,7 @@ contract ContractA is ContractB {
         errorCount++;
         return (0, false);
     } catch (bytes memory) {
-        errorCount++;
+        errorCount = errorCount + 1;
         return (0, false);
     }
   }

test/units/buidler/standard.js

@@ -284,7 +284,7 @@ describe('Buidler Plugin: standard use cases', function() {
     const expected = [
       {
         file: mock.pathToContract(buidlerConfig, 'ContractA.sol'),
-        pct: 87.5
+        pct: 61.54
       },
       {
         file: mock.pathToContract(buidlerConfig, 'ContractB.sol'),