2.058 broke my build. Is this a bug?

[Caligo]

That was a typo, and it doesn't change anything.  Here is a shorter version:

----------------8<----------------8<----------------
import std.datetime;
import std.stdio;

struct A{

  auto fun(A a){ return 0; }
}

void bench(alias fun)(string msg, uint n = 1_000_000){

  auto b = benchmark!fun(n);
  writefln(" %s %s ms", msg, b[0].to!("msecs", int));
}

unittest{

  A a, b;

  void test1(){
    auto r = a.fun(b);
  }

  bench!( {auto r = a.fun(b);} )("Does Not work");
  bench!(test1)("Works");
}

void main(){ }
---------------->8---------------->8----------------



And here is the error:

/usr/include/d/dmd/phobos/std/datetime.d(30986): Error: safe function
'benchmark' cannot call system delegate '__lambda1'
t1.d(11): Error: template instance
t1.__unittest2.benchmark!(__lambda1) error instantiating
t1.d(23):        instantiated from here: bench!(delegate @system void()
{
int r = a.fun(b);
}
)
t1.d(23): Error: template instance t1.__unittest2.bench!(delegate @system void()
{
int r = a.fun(b);
}
) error instantiating