CTFE bug?

[Simen Kjærås]

On Monday, 21 January 2019 at 00:44:02 UTC, Manu wrote:
> Does anyone understand: 
> https://issues.dlang.org/show_bug.cgi?id=19598 And are there 
> any known workarounds?

Defining an opAssign for S seems to work:

int test()
{
     struct S { int x; void opAssign(S s) { x = s.x; } }
     S t1;
     S* n1 = new S;
     *n1 = t1;

     return 10;
}
pragma(msg, test());

Fascinatingly, it seems 'new' is doing something special in this 
code - replacing 'new S' with '&t1', things compile.

Second workaround: create an array of S, then take the address of 
the first one:

int test2()
{
     struct S { int x;  }
     S t1;
     S* n1 = &(new S[1])[0];
     *n1 = t1;

     return 10;
}
pragma(msg, test2());

Now, as for why the simple, sensible code in the bug report 
doesn't work, I have no idea. It seems `new S` marks the block in 
some way that prevents regular assignment from working.

--
   Simen