Function without_try_catch_frame_call 

unsafe fn without_try_catch_frame_call(cond: SEXP) -> SEXP

cond, or a shallow copy of it whose call element is NULL when that element is the tryCatch() frame’s call: the condition REvalError::reraise signals, with the call REvalError::call reports.

Safety

R’s main thread; cond rooted by the caller. The result is unprotected.