[Issue 23336] New: cannot take const struct member address at CTFE

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23336

          Issue ID: 23336
           Summary: cannot take const struct member address at CTFE
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dkorpel at live.nl

See: https://forum.dlang.org/post/mgbmiwyrhivvbfoaelsx@forum.dlang.org

It's possible to take the address of a global struct variable and store it in a
const variable, but you can't take the address of a struct member:
```
struct S
{ 
    uint a, b;
}
__gshared const S d = {3, 4};

__gshared const e0 = &d; // allowed
__gshared const e1 = &d.a; // error
```

The error is: cannot use non-constant CTFE pointer in an initializer `&d.a`

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