Feature Request: Make Missing mapping Errors More Informative

[billdenney]

When generating a plot recently, I accidentally left out the mapping. When running the code, I got an uninformative error indicating that the mapping was missing. Can the errors for missing mappings be improved to indicate something similar to "No mapping provided for required aesthetic 'x'" (and similar)?

library(ggplot2)         
ggplot(data.frame(A=1)) +
geom_line()              
#> Error in order(data$PANEL, data$group, data$x): argument 3 is not a vector

[Ax3man]

This error is specific to geom_line it seems.

[hadley]

Yes, this is already done in general; but geom_line() seems to have slipped through the cracks.

[dpseidel]

This is a variant of the same issue documented in #2637. The error is caused because Geom*$setup_data runs before check_required_aes() in layer$compute_geom_1(). I'm testing the fix and should have a PR shortly.

[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/