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3 days ago
Gravatar of Nick TreleavenPosted by Nick Treleaven
in reply to Rajesh		Reply
Nick Treleaven
Gravatar of Nick Treleaven
Posted in reply to Rajesh


Reply

On Monday, 30 June 2025 at 04:51:58 UTC, Rajesh wrote:

>

On Sunday, 29 June 2025 at 21:56:19 UTC, 0xEAB wrote:

>

On Sunday, 29 June 2025 at 13:06:38 UTC, Rajesh wrote:

>

Is there a restriction that I cannot call return from foreach (opApply delegate) if it is executed at compile time?

To me this looks like a compiler bug where it runs into a wrong assumption once it finds the return statement in the foreach body and has to give up earlier.

Thanks for your reply. It looks like a bug to me as well, but I wanted to confirm with experts if it's a known issue or a limitation before I file a bug report.

I've now filed this:
https://github.com/dlang/dmd/issues/21502

3 days ago
Gravatar of Nick TreleavenPosted by Nick Treleaven
in reply to Manfred Nowak		Reply
Nick Treleaven
Gravatar of Nick Treleaven
Posted in reply to Manfred Nowak


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On Monday, 30 June 2025 at 14:30:49 UTC, Manfred Nowak wrote:

>

On Sunday, 29 June 2025 at 13:06:38 UTC, Rajesh wrote:

[...]

> struct Problem {
>     this(int val) {
>         foreach (int number; myType)
>             return;

[...]

>

Is there a restriction [...]

Yes.

'this' is not allowed to have a 'return' (15.13.0.2) ...
and to exit a 'foreach'-loop needs a 'break' (12.11.0.6).

So the compiler should not compile that program even for runtime.

return can be used to exit foreach (as can goto or throw), and return; can be used in a constructor. The latter I'll look at clarifying in the spec. The issue from this thread is just a limitation of CTFE.

10 hours ago
Gravatar of RajeshPosted by Rajesh
in reply to Nick Treleaven		Reply
Rajesh
Gravatar of Rajesh
Posted in reply to Nick Treleaven


Reply

On Thursday, 3 July 2025 at 15:29:53 UTC, Nick Treleaven wrote:

>

On Monday, 30 June 2025 at 04:51:58 UTC, Rajesh wrote:

>

On Sunday, 29 June 2025 at 21:56:19 UTC, 0xEAB wrote:

>

On Sunday, 29 June 2025 at 13:06:38 UTC, Rajesh wrote:

>

Is there a restriction that I cannot call return from foreach (opApply delegate) if it is executed at compile time?

To me this looks like a compiler bug where it runs into a wrong assumption once it finds the return statement in the foreach body and has to give up earlier.

Thanks for your reply. It looks like a bug to me as well, but I wanted to confirm with experts if it's a known issue or a limitation before I file a bug report.

I've now filed this:
https://github.com/dlang/dmd/issues/21502

Thanks Nick

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