typedef: what's it good for?

[BCS]

Hello Simen,

> [...] suggest that
> 
> typedef int foo;
> 
> be kept as it is, and
> 
> typedef int bar {
> /* stuffs */
> }
> be sugar for
> 
> struct bar {
> int _payload;
> alias _payload this;
> /* stuffs */
> }

One important aspect of what I proposed is that operators that aren't overridden 
still exist and use the same codegen as the base type (or are guarantied 
to generate the same machine code in all cases).