The `assert` is very handy statement, but when it fails there's **no info why
it failed**.
let a = 1
let b = 2
assert a == b
Run
Error:
Error: unhandled exception: /usercode/in.nim(4, 8) `a == b`
[AssertionDefect]
Run
And when you see such assert error in console, you usually need to do:
* Go to source and find where this assert is defined
* Add `echo a, b`
* Run program again
* If it's server, you need to re-create all the condition to hit it
Lot of boring work. Would be better if `assert` would also **tell us why it
failed**.
For example, if assert is used for equality test `assert a == b` and if string
representations of `$a` and `$b` are short - print it along with the error.
Or, if it's not desirable for the `assert` default behavior, allow to extend it
with `assert_hook`, something like `when compile(assert_hook(a, b)):
assert_hook(a, b)`.
