[Haskell-cafe] double colon equal

[Eugene Kirpichov]

google://BNF

2009/9/29 xu zhang <douyaxu at gmail.com>:
> Hi, is there anyone can tell me what does the ::= mean?
> And what does the code below mean?
>
> expr ::= expr addop term | term
>
> Thank you in advance!
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-- 
Eugene Kirpichov
Web IR developer, market.yandex.ru