[Haskell-cafe] Using _ on the RHS of an equation?

[Christopher Done]

On 5 April 2011 18:00, James Cook <mokus at deepbondi.net> wrote:

> It's quite hacky, but this can be done with CPP and quasiquoting
> (incidentally, it would be _REALLY_ nice if 'undefined' and 'error' had
> similar source-location-dependent error messages by default):
>
>
> https://github.com/mokus0/junkbox/commit/bad59f486c3457f1d880a1cfa5b1baa33aff4ade


#define undefined   [underscore|"undefined" at line __LINE__ in __FILE__|]

That's nice, I like it. Wanted something like this for a while. I rarely get
exceptions in Haskell so that it's not even a bother when I don't know what
line number an exception came from, even undefined, but it's nice to have
it.
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