DIP1028 and phobos

[Uknown]

With DIP 1028 finally being accepted, we now have @safe by 
default. If we ignore the extern function controversies around 
the DIP for a second, its worth looking at some of the other 
issues that DIP 1028 brings.

Consider the following trivial code:

void main(string args[]) @safe
{
     import std.stdio : stderr;
     if (args.length != 2) {
         stderr.writeln("usage: %s filename");
         return;
     }
}

This does not compile, because stderr, stdin and stdout are all 
marked @system. Technically, I understand why they are marked 
@system, but practically, most people would expect something like 
this to Just Work, without having to mark main @system, or use () 
@trusted {...}();

I think given DIP 1000 and DIP 1028, its worth looking into 
phobos and reviewing other "trivial" stuff that should work with 
@safe but doesn't, and coming up with ways to fix them.