"Daniel Gibson"  wrote in message news:[email protected]...

* passing stuff to the function is done as C expects it (not done,
   also: are there other cases than the static array one that are
   different?)

Dynamic arrays.

D used to allow passing static and dynamic arrays to C varargs with no problems. This lead to nasty segfaults, especially with this code:

printf("Hello %s\n", "segfault");

which looks perfectly valid in D but certainly isn't. What you actually meant to pass is up to you to specify. It would not make a lot of sense for C functions to have a different set of implicit conversion rules to other functions.

* Disallowing template arguments (because how would I declare and call
   that function in C?) (not done)

This is probably worth reporting, I doubt it works correctly.

* /Maybe/ disallowing types as arguments/return types that are not
   supported by C (D classes; not done)?
   (OTOH, one the C side one could just handle them as void* and pass
   instances around opaquely)

Yes, this is why they are not disallowed.  This is just too damn useful.

printf("Pointer: %p\n", new Class());

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