================================================================================
Procedures
================================================================================

proc foo {arg1 arg2} {
    echo "hello"
    echo "word$hi \$bye word"
}

--------------------------------------------------------------------------------

(source_file
  (procedure
    (simple_word)
    (arguments
      (argument
        (simple_word))
      (argument
        (simple_word)))
    (braced_word
      (command
        (simple_word)
        (word_list
          (quoted_word)))
      (command
        (simple_word)
        (word_list
          (quoted_word
            (variable_substitution
              (id))
            (escaped_character)))))))
