[phobos] Calling abort() on unhandled exception

[Andrei Alexandrescu]

Steve Schveighoffer wrote:
> What's hard about using something other than exceptions to print usage in short 
> scripts?
> 
> This looks just as readable/easy to me:
> 
> import std.usage;
> 
> int main(string[] args)
> {
>    checkUsage(args.length > 1, "Usage: prog args");
>    ....
> }
> 
> I also would like to see stack traces in small scripts too, esp. when the script 
> isn't throwing the exception.

Here's one example I used:

#!/usr/bin/env rdmd
import std.exception, std.file;
void main(string[] args) {
    enforce(args.length == 3,
       "Usage: trcopy file1 file2");
    auto tmp = args[2] ~ ".messedup";
    scope(failure) if (exists(tmp)) remove(tmp);
    copy(args[1], tmp);
    rename(tmp, args[2]);
}

It could end with at least a couple distinct exception types. Clearly 
we're not cutting the pie the right way. The right solution is - absent 
any handler, an exception leaking out of main() prints the message and 
exit(1).


Andrei