Re: Complicated Types: Prefer “alias this” Over “alias” For Easier-To-Read Error Messages

[Nick Sabalausky (Abscissa)]

On 05/21/2018 01:30 PM, Paul Backus wrote:
> 
> I'm not sure making `_data` private is really a good idea. For example, 
> this only works if `_data` is public:
> 
> import std.algorithm;
> import std.range;
> import std.stdio;
> 
> struct MyType
> {
>      auto _data = iota(10);
>      alias _data this;
> }
> 
> void main()
> {
>      MyType x;
>      x.each!writeln;
> }

Ouch, and the error message isn't very helpful either. I wonder what 
causes this to fail though, and whether it might simply be a compiler bug?