packrat::install() ignores "dependencies" parameter

I was having some trouble getting the "Suggests" dependencies of one of my local packages to install. The docs suggested that I should be able to add a "dependencies" param to packrat::install_local(), and it would be passed through to packrat::install(), where it would behave the same as in utils::install.packages().

It didn't work, so I took a look at the source code, and as far as I can tell, the "dependencies" parameter is declared (in R/install.R, on line 43, as part of the function definition for install), but then it's never referenced. And there doesn't seem to be any code that passes them on as, say, part of the whole argument list.

If I'm reading the git history correctly, it looks like this was a result of commit f9038b8c, which replaced a dependency on devtools::install() with packrat's own install() function.

Start by reading R/install.R around install() and tracing the install_local() call path; use utils::install.packages() as the behavioral reference. Done means the dependencies argument is honored so local packages' Suggests dependencies install as documented.