On Sat, Feb 15, 2020 at 1:23 PM 'John Clements' via users-redirect <
us...@plt-scheme.org> wrote:

> Yes, absolutely. One reason that students in my class wind up using cast
> quite frequently in their parsers is that they use patterns like (list (?
> symbol s) …) which (as I recall) expand into unannotated lambda’s, and
> always require a cast.

I like `assert` for those situations: it fails immediately if anything goes
wrong, and it uses a predicate, so it corresponds well to the `?` pattern.
(It can also perform better.)


> --

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