It's not always nice to share

[Walter Bright]

Tim Matthews wrote:
> Should this change the way pure functions work. for example:
> 
> module test;
> 
> int i; //tls
> 
> pure void foo(int arg)
> {
>     i = arg;
> }
> 
> void main()
> {
>     foo(2);
> }
> 
> 
>  Error: pure function 'foo' cannot access mutable static data 'i'

No. Pure functions cannot change global state, even if that global state 
is for one thread only.