load_all and R/unix and R/windows directories

[gaborcsardi]

Seems like load_all(), more precisely load_code() does not load .R files in the R/unix and R/windows subdirectories. As "Writing R Extensions" says in Section Package Subdirectories:

The R and man subdirectories may contain OS-specific subdirectories named unix or windows.

[gaborcsardi]

Looks like base R reads the source files like this:
https://github.com/wch/r-source/blob/b156e3a711967f58131e23c1b1dc1ea90e2f0c43/src/library/tools/R/admin.R#L235

I.e.:

tools::list_files_with_type("R", "code", full.names=FALSE)

This puts the unix/ subdir at the end, somewhat surprisingly, because then the usual zzz.R file is not the last any more....

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