How to Instantiate struct defined in template

[Craig Dillabaugh]

Hello,
I am trying to figure out how templates work and tried to define
the
following template to define vertices of any dimension and
operations
on them.

import std.stdio;
import std.random;
import std.range;
import std.conv;
import std.math;

/*
  * T must be one of the floating point types
  *   float, double, real _ I should be enforcing this.
  */
template  vt(T)
{
   struct vertex {
     this(T[] crds...) {
       if( crds.length < 2 ) {
         throw new.Exception("To small!");
       } else {
        coords.length = crds.length;
        foreach(ref v_coord, in_coord; lockstep(coords, crds))
        {
          v_coord = in_coord;
        }
       }
     }
     @property T x() { return coords[0];}
     @property T y() { return coords[1];}
     @property T z() { return ( coords.length < 3 ? T.nan :
coords[2] ); }
   }
        
   T euclid_dist(T a, T b) {
     T sum = 0;
     foreach( ref a_crd, ref b_crd; lockstep( a.coords, b.coords )
) {
       sum += (a_crd - b_crd)*(a_crd - b_crd );
     }
     return sqrt(sum);
   }
} //End of template

int main(string argv[] ) {
        vt!(float).vertex v1(0.0,0.0);
        vt!(float).vertex v2(3.0,4.0);
        writefln("The distance between vertex 1 and vertex 2 is ",
                vt!(float).euclid_dist(v1, v2) );
}

When I try to compile this I get the message:

vertex.d(57): Error: found 'v1' when expecting ';' following
statement
vertex.d(58): Error: found 'v2' when expecting ';' following
statement

Lines 57 and 58 are the first two lines in my main() function. I
can't figure out why, from the examples I've looked at I am using
the syntax properly, but am clearly missing something.

Also, since I don't really know what I am doing any criticisms on
how I am defining the vertex template are welcome.

Cheers,

Craig