[Rd] Better 'undefined columns' error for data.frame

[Dirk Eddelbuettel]

Andre,

On 25 September 2022 at 18:09, GILLIBERT, Andre wrote:
| Please, find the patch attached, based on the latest R SVN trunk code.

Well the mailing list software tends to drop attachments.  There is a reason
all these emails suggest to use bugs.r-project.org.

Dirk

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