it differ from assert because it contains the expression, file and line information. See this https://stackoverflow.com/questions/14420857/check-expect-example-in-racket
what's the closest thing we have in D? can we make it without compiler builtin?

On Wednesday, 22 December 2021 at 20:14:01 UTC, Dr Machine Code wrote:

Every error or exception in D has line and file information, stack trace and more, therefore you can catch AssertError and print the details if the default message printed on console is not enough.

For unit testing you have https://code.dlang.org/packages/dunit

On Wednesday, 22 December 2021 at 20:14:01 UTC, Dr Machine Code wrote:

if you just want to use an assert, the compiler flag -checkaction=context basically gives you this kind of error messages.

Example how to use in DUB (from serve-d): https://github.com/Pure-D/serve-d/blob/84094fade433f3d52e43c5296d20af53b102ffdd/dub.json

void main()
{
    assert(1 + 1 == 2);
    assert(1 + 1 == 1);
}

__EOF__

Sample output:

core.exception.AssertError@onlineapp.d(4): 2 != 1
----------------
??:? _d_assert_msg [0x563912072788]
./onlineapp.d:4 _Dmain [0x563912069f54]

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