On Tue, May 14, 2019 at 07:05:41AM +0200, Marco Maggi wrote:
> Ciao,
>
> in the "record-variants" egg there is:
>
>(##core#check (##sys#check-structure x ',original-name))
>
> I understand what:
>
>(##sys#check-structure x ',original-name)
>
> does, but what is the "##core#check" for? In other code I see
> "##sys#check-structure" uses without it.
It's an annotation in the core language (see core.scm) that causes the
expression inside to be eliminated in unsafe mode. In normal mode, it
will just walk the expression as if the ##core#check wasn't there.
Cheers,
Peter
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