I have installed DRush 6 and a fresh Drupal 8 site (once thru git and once thru zip) and get the following error when I do "drush up"

Fatal error: Call to undefined function _update_cache_clear() in C:\ProgramData\ Drush\commands\pm\update_info\drupal.inc on line 63
 
Anyone else had this experience?
Trying to determine if this is an issue to be reported.

Thanks
Tony



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Anthony Stefan Maciejowski

www.Tony-Mac.com