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Running the tests in ‘tests/nested_futures,mc.cores.R’ failed.
Last 13 lines of output:
  
  $pid1
  [1] 17999
  
  $pid2
  [1] 17999
  
  plan(list('multisession':2, 'multisession':2)):
  Warning in makeClusterPSOCK(workers, ...) : NAs introduced by coercion
  Warning in socketConnection("localhost", port = port, server = TRUE, blocking = TRUE,  :
    port 11049 cannot be opened
  Error in socketConnection("localhost", port = port, server = TRUE, blocking = TRUE,  : 
    cannot open the connection
  Calls: plan ... makeClusterPSOCK -> makeNode -> <Anonymous> -> socketConnection
  Execution halted