hadley/ggplot2 — pull request #701 by wch (2012-10-23 23:33:55+00:00)
Title: Gradual deprecation with gg_dep

This fixes #672. To use it, you specify the last version where the function was *good*. Example usage:

```
gg_dep("0.8.9", "blah blah blah")
```

Sample output:

```
# Differs by subminor version number
qplot(1:3, 1:3) + coord_cartesian(wise=T)
# wise argument to coord_cartesian is ignored (Deprecated; last used in version 0.9.0)

# Differs by minor version number
qplot(1:3, 1:3, colour=1:3) + scale_colour_continuous(legend=T)
# Warning message:
# "legend" argument in scale_XXX is deprecated. Use guide="none" for suppress the guide display. (Deprecated; last used in version 0.8.9)

```