Hi, SETUP: Consider three packages PkgA, PkgB and PkgC.
PkgA defines a generic function foo() and exports it; export(foo) PkgB imports PkgA::foo() and re-exports it; importFrom(PkgA, foo) export(foo) PkgC imports everything from PkgA and PkgB: imports(PkgA, PkgB) PROBLEM: Loading or attaching the namespace of PkgC will generate a warning: replacing previous import by 'PkgA::foo' when loading 'PkgC' This in turn causes 'R CMD check' on PkgC to generate a WARNING (no-go at CRAN): * checking whether package 'PkgC' can be installed ... WARNING Found the following significant warnings: Warning: replacing previous import by 'PkgA::foo' when loading 'CellularAutomaton' FALSE? Isn't it valid to argue that this is a "false" warning, because identical(PkgB::foo, PkgA::foo) is TRUE and therefore has no effect? /Henrik PS. The above can be avoided by using explicit importFrom() on PkgA and PkgB, but that's really tedious. In my case this is out of my reach, because I'm the author of PkgA and PkgB but not many of the PkgC packages. ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
