On Thursday, 16 March 2023 at 03:40:04 UTC, Elfstone wrote:
```D
struct Matrix(S, size_t M, size_t N)
{
}
alias Vec3(S) = Matrix!(S, 3, 1);
void main()
{
import std.stdio;
writeln(is(Vec3!float == Matrix!(S, 3, 1), S)); // `alias`
`S` is defined here
writeln(is(Matrix!(float, 3, 1) == Matrix!(S, 3, 1), S));
// Error: declaration `S` is already defined
}
```
Even though the following code compiles.
```D
writeln(is(Vec3!float == Matrix!(S, 3, 1), S));
writeln(is(Vec3!float == Matrix!(S, 3, 1), S));
```
Oops, the above code compiles, because I added comments!!!
Now this really doesn't compile:
```D
struct Matrix(S, size_t M, size_t N)
{
}
alias Vec3(S) = Matrix!(S, 3, 1);
void main()
{
import std.stdio;
writeln(is(Vec3!float == Matrix!(S, 3, 1), S));
writeln(is(Matrix!(float, 3, 1) == Matrix!(S, 3, 1), S));
}
```
