Error in re-building vignettes:
  ...
── Attaching packages ────────────────────────────────── tidyverse 1.2.1 ──
✔ ggplot2 3.0.0     ✔ purrr   0.2.5
✔ tibble  1.4.2     ✔ dplyr   0.7.6
✔ tidyr   0.8.1     ✔ stringr 1.3.1
✔ readr   1.1.1     ✔ forcats 0.3.0
── Conflicts ───────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag()    masks stats::lag()

Attaching package: 'jsonlite'

The following object is masked from 'package:purrr':

    flatten

Joining, by = "carrier"

 *** caught segfault ***
address (nil), cause 'unknown'

Traceback:
 1: curl::curl_fetch_memory(url, handle = h)
 2: (function (url) {    h <- curl::new_handle()    if (isTRUE(getOption("jsonld_use_accept", TRUE)))         curl::handle_setheaders(h, Accept = "application/ld+json, application/json")    req <- curl::curl_fetch_memory(url, handle = h)    if (req$status >= 400) {        json <- rawToChar(req$content)        if (jsonlite::validate(json)) {            data <- jsonlite::fromJSON(json)            if (length(data$message))                 stop(sprintf("(%s) %s", url, data$message))        }        stop(sprintf("Download (HTTP %d): %s", req$status, url))    }    headers <- curl::parse_headers_list(req$headers)    list(content_type = jsonlite::unbox(headers[["content-type"]]),         link = jsonlite::unbox(headers[["link"]]), final_url = jsonlite::unbox(req$url),         response_text = jsonlite::unbox(rawToChar(req$content)))})(url = "http://schema.org")
 3: do.call(FUN, ARGS)
 4: (function (strfun, args = "{}") {    FUN <- eval(parse(text = strfun))    ARGS <- as.list(jsonlite::fromJSON(args))    if (!is.function(FUN))         stop("Argument is not a valid function")    out <- do.call(FUN, ARGS)    jsonlite::toJSON(out)})("jsonld:::download", "{\"url\":\"http://schema.org\"}")
 5: evalq((function (strfun, args = "{}") {    FUN <- eval(parse(text = strfun))    ARGS <- as.list(jsonlite::fromJSON(args))    if (!is.function(FUN))         stop("Argument is not a valid function")    out <- do.call(FUN, ARGS)    jsonlite::toJSON(out)})("jsonld:::download", "{\"url\":\"http://schema.org\"}"), <environment>)
 6: evalq((function (strfun, args = "{}") {    FUN <- eval(parse(text = strfun))    ARGS <- as.list(jsonlite::fromJSON(args))    if (!is.function(FUN))         stop("Argument is not a valid function")    out <- do.call(FUN, ARGS)    jsonlite::toJSON(out)})("jsonld:::download", "{\"url\":\"http://schema.org\"}"), <environment>)
 7: doTryCatch(return(expr), name, parentenv, handler)
 8: tryCatchOne(expr, names, parentenv, handlers[[1L]])
 9: tryCatchList(expr, names[-nh], parentenv, handlers[-nh])
10: doTryCatch(return(expr), name, parentenv, handler)
11: tryCatchOne(tryCatchList(expr, names[-nh], parentenv, handlers[-nh]),     names[nh], parentenv, handlers[[nh]])
12: tryCatchList(expr, classes, parentenv, handlers)
13: tryCatch(evalq((function (strfun, args = "{}") {    FUN <- eval(parse(text = strfun))    ARGS <- as.list(jsonlite::fromJSON(args))    if (!is.function(FUN))         stop("Argument is not a valid function")    out <- do.call(FUN, ARGS)    jsonlite::toJSON(out)})("jsonld:::download", "{\"url\":\"http://schema.org\"}"), <environment>),     error = function (x)     x, interrupt = function (x)     x)
14: context_eval(join(src), private$context)
15: get_str_output(context_eval(join(src), private$context))
16: this$eval(src)
17: ctx$call("r_to_rdf", doc, options)
18: jsonld::jsonld_to_rdf(doc, options = list(base = getOption("rdflib_base_uri",     "localhost://"), format = "application/nquads"))
19: rdflib::rdf_parse(json, "jsonld")
20: as_rdf.list(R, context)
21: eval(expr, envir, enclos)
22: eval(expr, envir, enclos)
23: withVisible(eval(expr, envir, enclos))
24: withCallingHandlers(withVisible(eval(expr, envir, enclos)), warning = wHandler,     error = eHandler, message = mHandler)
25: handle(ev <- withCallingHandlers(withVisible(eval(expr, envir,     enclos)), warning = wHandler, error = eHandler, message = mHandler))
26: timing_fn(handle(ev <- withCallingHandlers(withVisible(eval(expr,     envir, enclos)), warning = wHandler, error = eHandler, message = mHandler)))
27: evaluate_call(expr, parsed$src[[i]], envir = envir, enclos = enclos,     debug = debug, last = i == length(out), use_try = stop_on_error !=         2L, keep_warning = keep_warning, keep_message = keep_message,     output_handler = output_handler, include_timing = include_timing)
28: evaluate::evaluate(...)
29: evaluate(code, envir = env, new_device = FALSE, keep_warning = !isFALSE(options$warning),     keep_message = !isFALSE(options$message), stop_on_error = if (options$error &&         options$include) 0L else 2L, output_handler = knit_handlers(options$render,         options))
30: in_dir(input_dir(), evaluate(code, envir = env, new_device = FALSE,     keep_warning = !isFALSE(options$warning), keep_message = !isFALSE(options$message),     stop_on_error = if (options$error && options$include) 0L else 2L,     output_handler = knit_handlers(options$render, options)))
31: block_exec(params)
32: call_block(x)
33: process_group.block(group)
34: process_group(group)
35: withCallingHandlers(if (tangle) process_tangle(group) else process_group(group),     error = function(e) {        setwd(wd)        cat(res, sep = "\n", file = output %n% "")        message("Quitting from lines ", paste(current_lines(i),             collapse = "-"), " (", knit_concord$get("infile"),             ") ")    })
36: process_file(text, output)
37: knitr::knit(knit_input, knit_output, envir = envir, quiet = quiet,     encoding = encoding)
38: rmarkdown::render(file, encoding = encoding, quiet = quiet, envir = globalenv())
39: vweave_rmarkdown(...)
40: engine$weave(file, quiet = quiet, encoding = enc)
41: doTryCatch(return(expr), name, parentenv, handler)
42: tryCatchOne(expr, names, parentenv, handlers[[1L]])
43: tryCatchList(expr, classes, parentenv, handlers)
44: tryCatch({    engine$weave(file, quiet = quiet, encoding = enc)    setwd(startdir)    find_vignette_product(name, by = "weave", engine = engine)}, error = function(e) {    stop(gettextf("processing vignette '%s' failed with diagnostics:\n%s",         file, conditionMessage(e)), domain = NA, call. = FALSE)})
45: buildVignettes(dir = "/home/hornik/tmp/R.check/r-release-gcc/Work/PKGS/rdflib.Rcheck/vign_test/rdflib")
An irrecoverable exception occurred. R is aborting now ...
Segmentation fault