• Kirill Kryukov (37/37) Mar 05 Hi all,
• Sergey (3/8) Mar 05 It seems working with dmd and ldc.
• Paul Backus (5/13) Mar 05 I tried compiling your example using both DMD and LDC, and was
• kdevel (4/7) Mar 05 Compiled your code with DMD v2.109.1, gdc (GCC) 11.3.0 and gdc
• Kirill Kryukov (3/3) Mar 06 Thanks for checking. Looks like it works with DMD, LDC, and older

Kirill Kryukov <kkryukov gmail.com> writes:

Hi all,

I was debugging an old project that started crashing after 
upgrading to a recent toolchain. I noticed that commenting out 
invariants helps. I reduced it to the following:

```
import std.conv: to;

struct A
{
     ulong n;
     string str()
     {
         if (n == 0) { return "0"; }
         return to!string(n);
     }
}

struct B
{
     ulong n;
     invariant() {}
     string str()
     {
         if (n == 0) { return "0"; }
         return to!string(n);
     }
}

void main()
{
     A a = { 1 };
     B b = { 2 };
     assert(a.str() == "1");  // OK
     assert(b.str() == "2");  // Fails
}
```

Is this a bug, or am I misunderstanding something?

Compiled with "gdc -Og -o repro repro.d", using gdc (GCC) 14.2.1 
20240912 (Red Hat 14.2.1-3), on Linux.

Thanks.

Sergey <kornburn yandex.ru> writes:

On Wednesday, 5 March 2025 at 16:58:18 UTC, Kirill Kryukov wrote:
 Hi all,
 Is this a bug, or am I misunderstanding something?

 Compiled with "gdc -Og -o repro repro.d", using gdc (GCC) 
 14.2.1 20240912 (Red Hat 14.2.1-3), on Linux.

 Thanks.

It seems working with dmd and ldc.
Maybe GDC specific bug?

Paul Backus <snarwin gmail.com> writes:

On Wednesday, 5 March 2025 at 16:58:18 UTC, Kirill Kryukov wrote:
 Hi all,

 I was debugging an old project that started crashing after 
 upgrading to a recent toolchain. I noticed that commenting out 
 invariants helps. I reduced it to the following:

[...]

 Is this a bug, or am I misunderstanding something?

 Compiled with "gdc -Og -o repro repro.d", using gdc (GCC) 
 14.2.1 20240912 (Red Hat 14.2.1-3), on Linux.

 Thanks.

I tried compiling your example using both DMD and LDC, and was 
unable to reproduce the crash. So this may be a GDC-specific 
problem.

kdevel <kdevel vogtner.de> writes:

On Wednesday, 5 March 2025 at 16:58:18 UTC, Kirill Kryukov wrote:
 Is this a bug, or am I misunderstanding something?

 Compiled with "gdc -Og -o repro repro.d", using gdc (GCC) 
 14.2.1 20240912 (Red Hat 14.2.1-3), on Linux.

Compiled your code with DMD v2.109.1, gdc (GCC) 11.3.0 and gdc 
(GCC) 12.1.0, using `gdc -Og -o repro repro.d` with the latter 
two: All executables ran without error.

Kirill Kryukov <kkryukov gmail.com> writes:

Thanks for checking. Looks like it works with DMD, LDC, and older 
GDC, so this could be a GDC regression. I'll try to post it in 
GDC (GCC) Bugzilla if I can get an account there.