added comments

Author: vladima

src/compiler/checker.ts

@@ -2059,6 +2059,10 @@ module ts {
  if (!links.resolvedType) {
  var arrayType = globalArrayType;
  if (!arrayType) {
+ // if user code contains augmentation for Array type that includes call\construct signatures with arrays as parameter\return types,
+ // then we might step here then during initialization of the global Array type when globalArrayType is not yet set.
+ // CODE: interface Array<T> { (): number[] }
+ // in this case just resolve name 'Array' again and get declared type of symbol
  var arrayTypeSymbol = resolveName(node, "Array", SymbolFlags.Type, /*nameNotFoundMessage*/ undefined, /*nameArg*/ undefined);
  Debug.assert(arrayTypeSymbol);
  arrayType = getDeclaredTypeOfSymbol(arrayTypeSymbol);