Bug?

[Wulfklaue via Digitalmars-d]

Some C playing around:

> import core.stdc.stdio;
> 
> void main()
> {
>     int x = 5;
>     printf("The action is:\n%s", x);
> }

There does not seem to be a type check on calling the C printf... 
%s expects a string but entering the wrong type like a integer 
simply dumps down to this.

> The action is:
> object.Error@(0): Access Violation

Playing around a bit more and even D can be made to crash:

> import std.stdio : writefln;
> void main()
> {
>     int x = 5;
>     writefln("The action is:\n%i", x);
> }

> std.format.FormatException at C:\D\dmd2\windows\bin\..\..\src\phobos\std\format.d(1744):

Interesting ways to crash the code. I do not think this is 
expected behavior. :)

And yes, i know that %i is not valid in this case but the fact 
that phobos simply crashes with a exception, no proper error 
warning ...

If this error was somewhere in a large code base, it will be hard 
and time consuming to track down as the dumps do not show any 
trace / line error information.

And side note: The first spot i look to report a bug, is on the 
DMD git repository ( and so do a lot of other people these days 
). Do not even know where the bugs are reported here. Not very 
convenient.