"My $str$ing nax"
"My ${str}$ing nax"
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Groovy script
  Compound Gstring
    PsiElement(Gstring begin)('"')
    GrStringContentImpl(GString content element)
      PsiElement(Gstring content)('My ')
    GString injection
      PsiElement($)('$')
      Reference expression
        PsiElement(identifier)('str')
    GrStringContentImpl(GString content element)
      ASTWrapperPsiElement(Gstring content)
        <empty list>
    GString injection
      PsiElement($)('$')
      Reference expression
        PsiElement(identifier)('ing')
    GrStringContentImpl(GString content element)
      PsiElement(Gstring content)(' nax')
    PsiElement(Gstring end)('"')
  PsiElement(new line)('\n')
  Compound Gstring
    PsiElement(Gstring begin)('"')
    GrStringContentImpl(GString content element)
      PsiElement(Gstring content)('My ')
    GString injection
      PsiElement($)('$')
      Closable block
        PsiElement({)('{')
        Parameter list
          <empty list>
        Reference expression
          PsiElement(identifier)('str')
        PsiElement(})('}')
    GrStringContentImpl(GString content element)
      ASTWrapperPsiElement(Gstring content)
        <empty list>
    GString injection
      PsiElement($)('$')
      Reference expression
        PsiElement(identifier)('ing')
    GrStringContentImpl(GString content element)
      PsiElement(Gstring content)(' nax')
    PsiElement(Gstring end)('"')