All tests pass on my machine. Could it be a different configuration of drdr?

These tests are about persistent scripts. Apparently all other tests pass, so it’s kind of surprising that these in particular don’t.

When I run with raco test --drdr it also works fine btw

Oh I see it’s racobc. Does this mean that the racocs tests all pass then?

No see http://drdr.racket-lang.org/60350/cs/racket/share/pkgs/quickscript-test/drracket.rkt\|http://drdr.racket-lang.org/60350/cs/racket/share/pkgs/quickscript-test/drracket.rkt

Ah. Then is there a standard procedure to be able to reproduce the failures on my machine? (I’m not running the very latest version, maybe I should start with that)

That would be the first thing I’d try

But in general there are a lot of reasons it might behave differently

Concurrency, different OS, different versions of other software, etc

hello, how is match , in Racket, implemented? That is, how to implement pattern matching? I like how clean it is.

This is a good intro to how it works: https://www.youtube.com/watch?v=IikGK8XP5_Q

thanks

Also: https://arxiv.org/abs/1106.2578\|https://arxiv.org/abs/1106.2578

Is it possible to match on a promise?

Probably like: (match a-thing [(app force <match-the-content>) ...])

If you wanted to be extra safe it would be: [(? promise? (app force ...)) ...]

Oh, I guess force works on any value though so you probably don’t need that second one.

So, like: [(? promise? <value>) …] ?

No, the app one is what you want.

Right, so this will match any a that is a raw value or a promise:

(match a [(app force v) v])

Yes

but I’ll need the 2nd one if I need to differentiate between a promise and a raw value

There is an example in Dybvig’s book on implementing pattern matching: https://www.scheme.com/tspl4/examples.html#./examples:h10