emacs/layers.personal/misctools/my-polymode/local/polymode/samples/minimal.md

If poly-markdown.el is loaded. This should work by default. Otherwise M-x poly-markdown+r-mode RET should do the job.

1 + 1

## [1] 2

 0.4 - 0.7 + 0.3  # what? it is not zero!

## [1] 5.551e-17

(message  "it works")

{
    
}

  if len($declaration) > 0 and $declaration::isTypedef:
      $Symbols::types.add($IDENTIFIER.text)
      print "define type "+$IDENTIFIER.text  # line 19