Thanks. Should be fixed in r-devel and 2.15 alpha from revision 58756.
(Nothing to do with trace() particularly. Low-level code to create "signature" objects was not returning an S4 object.)
On 3/14/12 9:48 PM, Martin Morgan wrote:
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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