The odd `foreach` behavior is a long-standing compiler bug.
The behavior with `opApply` is...

...copy.

Note that it is a very long standing issue that closures are not done...

...scripting languages have been doing for a long time, but it was very easy to...

That sounds like Sociomantic which is from a long time ago now.

Have you been a d-doomer long or is this new?

...this stuff shows we're not in good shape even after such a long time :/

...ret; ret !is null);
invariant (start <= end);

// Long versions
in { assert(n > 0); }
out (ret...

...prop_list;
        const(char)* str;
        int i32;
        long i64;
        double f64;
    }_U u;
}

enum string...

...that's been an issue for a long time; having unfunded one-man efforts maintain...

...Sometimes those checks take a bit too long to kick in and I misspeak.

They...