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")`.
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