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When using Mercurial, how do you undo all changes in the working directory since the last commit? It seems like this would be a simple thing, but it's escaping me.
For example, let's say I have 4 commits. Then, I make some changes to my code. Then I decide that my changes are bad and I just want to go back to the state of the code at my last commit. So, I think I should do:
hg update 4
with 4 being the revision # of my latest commit. But, Mercurial doesn't change any of the files in my working directory. Why not?