For reducing a D Interface file dependency when generating it
with the `-H` flag for DMD, you can't import a module on the top
level.
Take a look at that example:
```d
module a;
import std.stdio;
void printSomething(string a)
{
writeln(a);
}
```
If you generate the .di interface file while using dmd, it will
pretty much generate:
```d
module a;
import std.stdio;
void printSomething(string a);
```
Using the import inside the function scope, it will make the work
easier for dmd:
```d
module a;
void printSomething(string a)
{
import std.stdio;
writeln(a);
}
```
Will actually generate only:
```d
module a;
void printSomething(string a);
```
This will greatly reduce the number of import and dependencies
you need if you ever need to distribute a library.
