dmd -run speed trends

[Siarhei Siamashka]

On Thursday, 7 December 2023 at 16:32:32 UTC, Witold Baryluk 
wrote:
> Reference code:
>
> ```d
> #!/usr/bin/env -S dmd -run
> ```

This doesn't work nice from a read only directory:

```
$ pwd
/tmp/read_only_directory

$ ./test.d
Error: error writing file 'test.o'

$ rdmd test.d
John is 45 years old
Kate is 30 years old
3
9
15
xor
btc
mov
cli
afoo
```

But `rdmd` is much slower than `dmd -run`. As another possibly 
better alternative, changing the boilerplate to the following 
lines allows to use `dub` as a launcher:
```D
#!/usr/bin/env dub
/+dub.sdl:+/
```

The existence of the slow `rdmd` tool is a liability, because 
some outsiders may judge D compilation speed based on `rdmd` 
performance when comparing different programming languages.