[Rd] methods::trace fails when signature specified

[Martin Morgan]

With

 > R.version.string
[1] "R version 2.15.0 alpha (2012-03-14 r58748)"

trying to trace a method using the 'signature' argument fails rather 
than enabling the trace:

 > trace(initialize, signature="ANY")
Error in matchSignature(signature, fdef, where) :
   trying to match a method signature of class “signature”; expects a 
list or a character vector

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