[Issue 17800] [2.076] "static foreach" allocates closures in GC without reason

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17800

timon.gehr at gmx.ch changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |timon.gehr at gmx.ch

--- Comment #2 from timon.gehr at gmx.ch ---
The closure allocation error is not a bug in the `static foreach`
implementation. Reduced test case:

---
struct S{
    enum N=1;
}

void foo(S v) @nogc{
    enum x=()=>v.N;
}
---

Workaround:

---
int foo(S v)@nogc{
    enum x=typeof(v).N;
}
---


The second case is due to an oversight on my side.
It can be worked around using an alias:

struct S{
    enum N = 1;
}

S foo(S v)@nogc{
    alias R=typeof(return);
    static foreach(_;0..R.N){ }
    return S.init;
}

--