>> -- followed by a symbol does not start a comment, thus for example, haddock
>> declarations must begin with -- |, and not --|.
>>
>> What might --| mean, if not a comment? It doesn't seem possible to define it
>> as an operator.
>
> GHCi, at least, allows it.
>
> Prelude> let (--|) = (+)
> Prelude> 1 --| 2
> 3
I believe the motivating example that persuaded the Language Committee to allow
these symbols was
-->
which is not of course used anywhere in the standard libraries, but is an
extremely nice symbol to have available in user code.
Regards,
Malcolm
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