Error(s) in re-building vignettes:
--- re-building 'contributing-an-optimizer.Rmd' using rmarkdown
Error: processing vignette 'contributing-an-optimizer.Rmd' failed with diagnostics:
DLL 'rlang' not found: maybe not installed for this architecture?
--- failed re-building 'contributing-an-optimizer.Rmd'

--- re-building 'docker-readme.Rmd' using rmarkdown
Error: processing vignette 'docker-readme.Rmd' failed with diagnostics:
DLL 'rlang' not found: maybe not installed for this architecture?
--- failed re-building 'docker-readme.Rmd'

--- re-building 'opt-common-subexpr.Rmd' using rmarkdown
Error: processing vignette 'opt-common-subexpr.Rmd' failed with diagnostics:
DLL 'rlang' not found: maybe not installed for this architecture?
--- failed re-building 'opt-common-subexpr.Rmd'

--- re-building 'opt-constant-folding.Rmd' using rmarkdown
Error: processing vignette 'opt-constant-folding.Rmd' failed with diagnostics:
DLL 'rlang' not found: maybe not installed for this architecture?
--- failed re-building 'opt-constant-folding.Rmd'

--- re-building 'opt-constant-propagation.Rmd' using rmarkdown
Error: processing vignette 'opt-constant-propagation.Rmd' failed with diagnostics:
DLL 'rlang' not found: maybe not installed for this architecture?
--- failed re-building 'opt-constant-propagation.Rmd'

--- re-building 'opt-dead-code.Rmd' using rmarkdown
Error: processing vignette 'opt-dead-code.Rmd' failed with diagnostics:
DLL 'rlang' not found: maybe not installed for this architecture?
--- failed re-building 'opt-dead-code.Rmd'

--- re-building 'opt-dead-expr.Rmd' using rmarkdown
Error: processing vignette 'opt-dead-expr.Rmd' failed with diagnostics:
DLL 'rlang' not found: maybe not installed for this architecture?
--- failed re-building 'opt-dead-expr.Rmd'

--- re-building 'opt-dead-store.Rmd' using rmarkdown
Error: processing vignette 'opt-dead-store.Rmd' failed with diagnostics:
DLL 'rlang' not found: maybe not installed for this architecture?
--- failed re-building 'opt-dead-store.Rmd'

--- re-building 'opt-loop-invariant.Rmd' using rmarkdown
Error: processing vignette 'opt-loop-invariant.Rmd' failed with diagnostics:
DLL 'rlang' not found: maybe not installed for this architecture?
--- failed re-building 'opt-loop-invariant.Rmd'

SUMMARY: processing the following files failed:
  'contributing-an-optimizer.Rmd' 'docker-readme.Rmd'
  '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