def dollarSlashy = $/
-----
Groovy script
  Variable definitions
    Modifiers
      PsiElement(def)('def')
    PsiWhiteSpace(' ')
    Variable
      PsiElement(identifier)('dollarSlashy')
      PsiWhiteSpace(' ')
      PsiElement(=)('=')
      PsiWhiteSpace(' ')
      Literal
        GroovyASTPsiElementImpl($/ regex literal)
          PsiElement($/ regex begin)('$/')
          GrStringContentImpl(GString content element)
            ASTWrapperPsiElement($/ regex content)
              <empty list>
          PsiErrorElement:Dollar slash ending expected
            <empty list>