How does one remove variables from workspace?

[Leo Alekseyev]

Does Julia have an equivalent of R's rm() or Matlab's clear?  If I have a variable foo, how do I clear it so that I can load function foo defined in my source file?  If I have created 5 versions of function foo(.....) with different signatures, how do I nuke one or all of them? 

[Stefan Karpinski]

Although this is kind of annoying, at the moment, the only way to do this is to restart julia.

[Viti VT]

I suppose the same holds for types and const definitions? 

   or there is some way to "undefine" a type or a constant ? 

( I get a lot of warnings because of that )