Error(s) in re-building vignettes:
--- re-building ‘datastepping.Rmd’ using rmarkdown
dataStepClass            package:datastepr             R Documentation

_A_n _i_m_p_l_e_m_e_n_t_a_t_i_o_n _o_f _a _S_A_S _d_a_t_a_s_t_e_p _i_n _a _c_l_a_s_s

_D_e_s_c_r_i_p_t_i_o_n:

     An implementation of a SAS datastep in a class

_U_s_a_g_e:

     dataStepClass
     
_F_o_r_m_a_t:

     An 'R6Class' generator object

_F_i_e_l_d_s:

     'i' 'i' begins at 0 and is incremented for each iteration of the
          data step.

     'results' The 'results' frame is initialized as an empty data
          frame.  It is populated row-wise with each iteration of the
          data step.

     'continue' 'continue' is a marker which signals that the step
          should continue repeating. When 'continue' is 1, repetition
          will continue, and when 'continue' is 0, repitition will
          cease. It is initialized to 0.

     'eval' 'eval' is initialized as NULL, but will store a pointer to
          the current evaluation environment. This pointer helps pass
          the evaluation environment from one iteration of the data
          step to the next.

_M_e_t_h_o_d_s:

     'begin(env)' 'begin' does three things: imports the environment of
          the previous step to the current, stores the current
          environment (or the environment specified), and increments
          'i' by 1. It takes one argument, 'envir', which should
          typically be set to 'environment()'.

     'set(dataframe, group_id)' 'set' takes two arguments: a data frame
          and an optional unquoted 'group_id' variable. This 'group_id'
          variable must contain a consecutive sequence of natural
          numbers from 1 to some maximum. In each data step, rows where
          'i' matches the 'group_id' variable (or simply the ith row if
          no group_id variable is given) are selected, and the slice is
          split into vectors and imported into the evaluation
          environment.  'continue' is set to 0 once 'set' reaches the
          maximum value in the 'group_id' column, ceasing repetition of
          the datastep, else 'continue' is set to 1.

     'set_(dataframe, group_id)' A standard evaluation version of
          'set_', in which the 'group_id' variable is included as a
          string, formula, or lazy object.

     'output' 'output' takes an optional list argument. Either the
          list, or, if none is given, all vectors in the evaluation
          environment are gathered into a data.frame, and this
          data.frame appended to 'results'.

     'end' 'end' will, if 'continue' is 1, evaluate the function given
          within the evaluation environment. Typically, the function
          given will be the current function: that is, steps are joined
          recursively.

_E_x_a_m_p_l_e_s:

     step = dataStepClass$new()
     
     frame = data.frame(x = 1:10)
     
     stairs = function() {
       step$begin(environment())
       step$set(frame)
       y = x + 1
       step$output()
       step$end(stairs)
     }
     
     stairs()
     
     step$results
     

dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'datastepping.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘datastepping.Rmd’

SUMMARY: processing the following file failed:
  ‘datastepping.Rmd’

Error: Vignette re-building failed.
Execution halted