================================================================================
Variables
================================================================================

BASIC = $VARIABLE
GROUP = ${VARIABLE}

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

(document
 (assignment
  key: (identifier)
  value: (variable
      (identifier)))
 (assignment
  key: (identifier)
  value: (variable
      (identifier))))

================================================================================
Variables in strings
================================================================================

UNDERSCORE = "$VARIABLE_WITH_UNDERSCORE"
MULTIPLE = "variable is: ${VARIABLE}, and $ANOTHER !!!"

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

(document
 (assignment
  key: (identifier)
  value: (string
      (variable
       (identifier))))
 (assignment
  key: (identifier)
  value: (string
    (string_content)
    (variable
     (identifier))
    (string_content)
    (variable
     (identifier))
    (string_content))))