Fix a regression in PARSE caused by 8db79a9

This fixes an operator precedence typo in the check for "not COPY or
SET" which causes a few regressions in PARSE.
Merge pull request #182 from earl/fix-pr165-parse

Fix a regression in PARSE caused by 8db79a9. Thanks for quick fix, and no worries. Parse is very tight code, and it's nearly impossible to make even small change without running extensive regression tests.