[Issue 13629] Field postblit can't be generated for const field

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13629

--- Comment #2 from ag0aep6g at gmail.com ---
A workaround:

struct C
{
     const B[1] b_;
     @property ref const(B) b() {return b_[0];}
}

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