add file name/line number to error messages from file input
tree01f591269ba97414c5eec6ff12726d0bcb84ecf1
-rw-r--r-- 7092 README
drwxr-xr-x - common
drwxr-xr-x - docs
drwxr-xr-x - ex
drwxr-xr-x - vi