In SVN and Perforce, regardless of what I have edited at any time or the changelists I have open, I can run "svn update" or "p4 sync" and my local filesystem is updated to latest, and unless there's an actual file-level conflict, everything is hunky-dory.
What is the simplest way in Mercurial to do this? "hg fetch" has been suggested, but that refuses to operate if you have multiple changelists committed locally.