Check for non-zero length before calling list2env()

[wch]

This fixes #1444. I'd suggest making a release after merging, since this a blocker for many people.

[wch]

For future reference, the issue was fixed in R 3.1.2.
wch/r-source@e960933

[hadley]

It doesn't really matter, but I prefer to just leave it as .9000

[wch]

OK, I'll change it back.

[hadley]

LGTM. Want to squash it when you merge?

Actually can you also bump the required version to 3.1?

[wch]

OK, I bumped the R version and rebased into one commit.

[jonrobinson2]

Thank you! Any idea when this will be pushed to CRAN for release?

[jonrobinson2]

Is this being made into a release? Would love to be able to bump our version of ggplot2. This package is for example a dependency for the latest release of rstan (the STAN wrapper for R) , which means we can't use some of the latest stuff rolled into that package.

[steinmb]

Is this being made into a release?

No. I had to install from HEAD. It broke ggplot on raspberryPI (Debian Jessie) that installs R 3.1.x. This is how I worked around it:

Optional step. Only needed If you do not have devtools already installed in R.

install.packages("devtools")

Install development version of ggplot2

devtools::install_github("hadley/ggplot2")

[lock]

This old issue has been automatically locked. If you believe you have found a related problem, please file a new issue (with reprex) and link to this issue. https://reprex.tidyverse.org/