Print .nim files as they're compiled when --debug is used?
Or maybe a new `--printFiles` flag?

I'm trying to debug an error that occurs during `nimble install` with nim devel
```
Error: internal error: getTypeDescAux(tyEmpty)
No stack traceback available
To create a stacktrace, rerun compilation with './koch temp c <file>', see https://nim-lang.github.io/Nim/intern.html#debugging-the-compiler for details
```

Having `nimble install` print which `.nim` file it tried last (along with the other files before it, ofc) would allow me to do `./koch temp c <file>` to generate the stack traceback.

Alternatively, having a way to tell `nimble install` to use `koch temp` when compiling would also work, I think.