On Monday, 24 February 2020 at 00:50:38 UTC, ric maicle wrote:
[dmd 2.090.1 linux 64-bit]

The following code does not report the correct unit test summary.
The report says 1 unit test passed.

~~~~~
shared static this() {
    import core.exception;
    assertHandler(&cah);
}

void
cah(string file, ulong line, string msg) nothrow {
    import core.stdc.stdio: printf;
    printf("==============================\n");
printf("Assert error: %s %d: %s\n", file.ptr, line, msg.ptr);
    printf("==============================\n");
}

unittest {
    assert(false);
}
~~~~~

Looks like you have to throw an Error at the end of your custom handler, e.g:

---
void
cah(string file, ulong line, string msg) nothrow {
    import core.stdc.stdio: printf;
    import core.exception : AssertError;
    printf("==============================\n");
    printf("Assert error: %s %d: %s\n", file.ptr, line, msg.ptr);
    printf("==============================\n");
    throw new AssertError("");
}
---

For a betterC program you can use an HLT:

---
void
cah(string file, ulong line, string msg) nothrow {
    import core.stdc.stdio: printf, fflush, stdout;
    printf("==============================\n");
    printf("Assert error: %s %d: %s\n", file.ptr, line, msg.ptr);
    printf("==============================\n");
    fflush(stdout);
    asm nothrow { hlt; }
}
---

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