[R] CI job shows NOTE due to "non-API call" Rf_findVarInFrame

[thisisnic]

Describe the bug, including details regarding any error messages, version, and platform.

https://github.com/ursacomputing/crossbow/actions/runs/23173070742/job/67329183522#step:5:23703

Component(s)

R

[thisisnic]

See https://github.com/RcppCore/Rcpp/pull/1423/changes for an example of how to solve