Error(s) in re-building vignettes:
--- re-building ‘contributing-an-optimizer.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘contributing-an-optimizer.Rmd’

--- re-building ‘docker-readme.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘docker-readme.Rmd’

--- re-building ‘opt-common-subexpr.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Coordinate system already present. Adding new coordinate system, which will replace the existing one.
Quitting from lines 79-86 (opt-common-subexpr.Rmd) 
Error: processing vignette 'opt-common-subexpr.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘opt-common-subexpr.Rmd’

--- re-building ‘opt-constant-folding.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Coordinate system already present. Adding new coordinate system, which will replace the existing one.
Quitting from lines 72-79 (opt-constant-folding.Rmd) 
Error: processing vignette 'opt-constant-folding.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘opt-constant-folding.Rmd’

--- re-building ‘opt-constant-propagation.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Coordinate system already present. Adding new coordinate system, which will replace the existing one.
Quitting from lines 86-93 (opt-constant-propagation.Rmd) 
Error: processing vignette 'opt-constant-propagation.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘opt-constant-propagation.Rmd’

--- re-building ‘opt-dead-code.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Coordinate system already present. Adding new coordinate system, which will replace the existing one.
Quitting from lines 117-124 (opt-dead-code.Rmd) 
Error: processing vignette 'opt-dead-code.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘opt-dead-code.Rmd’

--- re-building ‘opt-dead-expr.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Coordinate system already present. Adding new coordinate system, which will replace the existing one.
Quitting from lines 86-93 (opt-dead-expr.Rmd) 
Error: processing vignette 'opt-dead-expr.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘opt-dead-expr.Rmd’

--- re-building ‘opt-dead-store.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Coordinate system already present. Adding new coordinate system, which will replace the existing one.
Quitting from lines 121-128 (opt-dead-store.Rmd) 
Error: processing vignette 'opt-dead-store.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘opt-dead-store.Rmd’

--- re-building ‘opt-loop-invariant.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Coordinate system already present. Adding new coordinate system, which will replace the existing one.
Quitting from lines 85-92 (opt-loop-invariant.Rmd) 
Error: processing vignette 'opt-loop-invariant.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘opt-loop-invariant.Rmd’

SUMMARY: processing the following files failed:
  ‘opt-common-subexpr.Rmd’ ‘opt-constant-folding.Rmd’
  ‘opt-constant-propagation.Rmd’ ‘opt-dead-code.Rmd’
  ‘opt-dead-expr.Rmd’ ‘opt-dead-store.Rmd’ ‘opt-loop-invariant.Rmd’

Error: Vignette re-building failed.
Execution halted