title: error in for-loops: could not find function "check_reserved"
body: <p>When using R studio I get an error trying to use for-loops</p>
  <p><code> for(i in 1:4){print(i)} Error in check_reserved(for_var_name) :  could not find function &quot;check_reserved&quot;</code></p>
  <p>Anyone any clue how to solve this? I've updated R, RStudio and restarted the session as well</p>
  <p>session info:</p>
  <pre><code>R version 4.1.1 (2021-08-10) Platform: x86_64-apple-darwin17.0
  (64-bit) Running under: macOS Big Sur 10.16
  
  Matrix products: default
  
  LAPACK:
  /Library/Frameworks/R.framework/Versions/4.1/Resources/lib/libRlapack.dylib
  
  attached base packages: [1] stats graphics grDevices utils datasets
  methods base
  
  loaded via a namespace (and not attached): [1] compiler_4.1.1
  tools_4.1.1
  </code></pre>
  <p>Thanks!</p>