Weird DMD codegen issue

[max haughton]

On Thursday, 4 November 2021 at 16:32:54 UTC, Stanislav Blinov 
wrote:
> So I have a function:
>
> ```d
> auto foo(C, K)(Strukt1* s, Strukt2 a, uint b, scope C c, scope 
> K k, out Strukt3 r)
> { /* ... */ }
> ```
>
> Where return type is `Strukt4`. dmd borks the first argument on 
> call (at least on Linux). Workarounds so far I found:
>
> 1) adding `extern(C)`
> 2) reducing number of parameters - five is fine, as soon as I 
> add the sixth or more - it breaks (but not with `extern(C)`).
>
> Problem is, I tried reproducing it outside of codebase, with no 
> success :( Does that sound familiar to anyone? Maybe there's 
> already a report about this on bugzilla? Any pointers on 
> tracking this down?

Dustmite?
At very least can you give the definitions of the types used at 
the call site where it breaks.