Changed some err back to failure. This should fix the problem where some of the sample tape files were failing with syntax errors. Using err prevents parser backtracking, which in this case was actually needed.
Changed some err back to failure. This should fix the problem where some of the sample tape files were failing with syntax errors. Using err prevents parser backtracking, which in this case was actually needed.

jhclark/ducttape,jhclark/ducttape,jhclark/ducttape