add setTimeout to get rid of max callstack size

src/util/internalCallTree.js

@@ -109,9 +109,10 @@ function buildTree (tree, step, scopeId, cb) {
   * @param {Function} cb  - callback
   */
 function visitStep (tree, step, scopeId, subScope, cb) {
+  setTimeout(() => {
     extractSourceLocation(tree, step, (error, sourceLocation) => {
       if (error) {
-      console.log(error)
+        cb(error)
       } else {
         if (sourceLocation.jump === 'i') {
           buildTree(tree, step + 1, scopeId === '' ? subScope.toString() : scopeId + '.' + subScope, function (error, outStep) {
@@ -129,7 +130,7 @@ function visitStep (tree, step, scopeId, subScope, cb) {
         } else {
           if (tree.includeLocalVariables) {
             var variableDeclaration = resolveVariableDeclaration(tree, step, sourceLocation)
-          if (variableDeclaration) {
+            if (variableDeclaration && !tree.scopes[scopeId].locals[variableDeclaration.attributes.name]) {
               tree.traceManager.getStackAt(step, (error, stack) => {
                 if (!error) {
                   tree.solidityProxy.contractNameAt(step, (error, contractName) => { // cached
@@ -155,6 +156,7 @@ function visitStep (tree, step, scopeId, subScope, cb) {
         }
       }
     })
+  }, 0)
 }
 
 function extractSourceLocation (tree, step, cb) {