Check unexpected "Local" keyword in cmd before opening a proof (fix #2975)
Check unexpected "Local" keyword in cmd before opening a proof (fix #2975)

 This fix isn't ideal. Instead, something like States.with_heavy_rollback
 should be able to cancel a proof started during a command interp that failed.
 But anyway, "le mieux est l'ennemi du bien"...

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@16333 85f007b7-540e-0410-9357-904b9bb8a0f7

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