Oh, and here's another minor update. I've added another `public
import` line to the module to ensure it actually works correctly
when imported:
```D
public import std.stdio;
```
Previously I had carelessly omitted this because I was using
`trace.d` only in contexts where `std.stdio` had already been
imported, but clearly that would need remedied in the general use
case.
The `public import`s make the imports visible in the module of
any module that imports `trace.d`, whereas otherwise such
necessary dependencies for use wouldn't be visible.
Text based D macros (`string` `mixin`s) can't know their
dependencies, I'd imagine, hence the reason for adding the two
imports (of `std.stdio` and `std.conv`).
