Barry,
it is not a warning nor plain output, it is a message, so you can use > d = data.frame(x=1:10) > x=1 > suppressMessages(attach(d)) > Looking at the history, this used to be cat() but got changed to a message in R 3.2.0 (r65385, CCIng Martin in case he remembers the rationale for warning vs message). I don't know for sure why it is not a warning, but I can see that it is more in the line with informative messages (like package masking) as opposed to a warning - in fact the change suggest that the intention was to synchonize both. That said, I guess the two options are to clarify the documentation (also in library()) or change to a warning - not sure what the consequences of the latter would be. Cheers, Simon > On 10/08/2021, at 2:06 AM, Barry Rowlingson <b.rowling...@lancaster.ac.uk> > wrote: > > If I mask something via `attach`: > >> d = data.frame(x=1:10) >> x=1 >> attach(d) > The following object is masked _by_ .GlobalEnv: > > x >> > > I get that message. The documentation for `attach` uses the phrase > "warnings", although the message isn't coming from `warning()`: > > warn.conflicts: logical. If ‘TRUE’, warnings are printed about > ‘conflicts’ from attaching the database, unless that database > contains an object ‘.conflicts.OK’. A conflict is a function > masking a function, or a non-function masking a non-function. > > and so you can't trap them with options(warn=...) and so on. This sent me > briefly down the wrong track while trying to figure out why R was showing a > masking error in one context but not another - I wondered if I'd supressed > warning()s in the other context. > > Personally I'd like these messages to be coming from warning() since that > seems the appropriate way to warn someone they've done something which > might have unwanted effects. But fixing the documentation to say "If > ‘TRUE’, *messages* are printed" is probably less likely to break existing > code. > > Happy to add something to bugzilla if anyone thinks I'm not being overly > pedantic here. > > Barry > > [[alternative HTML version deleted]] > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
