SHELL_SCRIPT
  COMMANDS_LIST
    EVAL_COMMAND
      PsiElement(eval)('eval')
      PsiWhiteSpace(' ')
      SIMPLE_COMMAND_ELEMENT
        PsiElement($)('$')
        SUBSHELL_COMMAND
          PsiElement(()('(')
          COMPOUND_LIST
            SIMPLE_COMMAND
              GENERIC_COMMAND_DIRECTIVE
                LITERAL
                  PsiElement(word)('echo')
              PsiWhiteSpace(' ')
              STRING
                PsiElement(OPEN_QUOTE)('"')
                PsiElement(STRING_CONTENT)('ZZ=1')
                PsiElement(CLOSE_QUOTE)('"')
          PsiElement())(')')