@event x for debugging

[jariji]

For debugging (@show x) == (@show y) is convenient because

• it shows the expressions and
• it returns them so @show can be used inline without a separate assignment step.

event! is convenient because it shows values only for failing tests.

I would like a combination @event x that shows expressions and returns them for failing tests.

[Seelengrab]

Yes, I was already thinking of something like this to use as a convenient shorthand for event!, using the stringified version of the captured expression as the event name. The code should be fairly straightforward; a PR would be very appreciated!

[jariji]

I've never understood how hygiene works in Julia. This is apparently wrong, but best I could do

@eval Supposition macro event(ex)
    :(event!($(string(ex)), $(esc(ex))); $(esc(ex)))
end


asdf = 5
@macroexpand1 Supposition.@event asdf


@check ne_self(x=Data.Integers{Int}()) = (@event x) ≠ x