Nothing
# Mock a function by tracing it's guts out. Untrace to unmock.
# Quick and dirty, not thoroughly tested.
mock <- function(f, tracer, where=f, print=FALSE) {
editor <- function(name, file, title) {body(name) <- tracer; name}
old.edit <- options(editor=editor)
on.exit(options(old.edit))
invisible(
eval(
bquote(trace(.(substitute(f)), edit=TRUE, print=FALSE, where=.(where))),
parent.frame()
) ) }
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