Function R_WeakRefKey 

unsafe fn R_WeakRefKey(w: SEXP) -> SEXP

Get the key from a weak reference. Checked wrapper for R_WeakRefKey. Calls R_WeakRefKey_unchecked and routes through with_r_thread. Generated from source location line 3880, column 8. Generated from source file miniextendr-api/src/ffi.rs.