Avoid Discard constraints #47
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paf31
reviewed
Feb 15, 2017
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| -- | Provide a default result in the case where a parser fails without consuming input. | ||
| option :: forall m s a. Monad m => a -> ParserT s m a -> ParserT s m a | ||
| option a p = p <|> pure a | ||
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| -- | Optionally parse something, failing quietly. | ||
| optional :: forall m s a. Monad m => ParserT s m a -> ParserT s m Unit | ||
| optional p = (do p | ||
| pure unit) <|> pure unit | ||
| optional p = (void p) <|> pure unit |
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Nitpick: Redundant parens here.
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Great, thanks! |
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