object-r6.md
In roxygen2: In-Line Documentation for R

extract_r6_data without source refs

Code
  extract_r6_data(C)
Condition
  Error in `map_int()`:
  i In index: 1.
  i With name: meth1.
  Caused by error:
  ! R6 class <foo> lacks source references.
  i If you are using the `installed` load method in `DESCRIPTION`, then try re-installing the package with option '--with-keep.source', e.g. `install.packages(..., INSTALL_OPTS = "--with-keep.source")`.