Truncate long calls in abort()

[thomasp85]

Currently, adding a multiline call to an error will result in the call vanishing completely. It would be nice if instead the call was truncated and an ellipsis was added to show truncation has occurred.

Current behaviour:

> call <- quote(geom_point(aes(x = mpg, y = disp, size = after_stat(x)), colour = "lightblue", position = position_jitter(width = 3)))
> abort("test", call = I(call))
Error:
! test
Run `rlang::last_error()` to see where the error occurred.

Expected behaviour:

> call <- quote(geom_point(aes(x = mpg, y = disp, size = after_stat(x)), colour = "lightblue", position = position_jitter(width = 3)))
> abort("test", call = I(call))
Error in `geom_point(aes(x = mpg, y = disp, size = after_stat(x))...`:
! test
Run `rlang::last_error()` to see where the error occurred.

[lionel-]

Also look into why foo$bar() calls are not shown in error messages.

[lionel-]

As discussed on Slack, for now we'll keep this undocumented behaviour AsIs ;-)