Tricky DMD bug, but I have no idea how to report

JN 666total at
Fri Feb 8 23:36:03 UTC 2019

On Friday, 8 February 2019 at 23:30:44 UTC, H. S. Teoh wrote:
> On Fri, Feb 08, 2019 at 10:45:39PM +0000, JN via 
> Digitalmars-d-learn wrote: [...]
>> Anyway, I reduced the code further manually. It's very hard to 
>> reduce it any further. For example, removing the assignments 
>> in fromEulerAngles static method hides the bug.  Likewise, 
>> replacing writeln with assert makes it work properly too.
> Pity we couldn't get rid of std.stdio.  It's a pretty big piece 
> of code, and there are plenty of places where it may go wrong 
> inside, even though we generally expect that the bug lies 
> elsewhere.  Oh well.  Hopefully somebody else can dig into this 
> and figure out what's going on.
> Hmm. I just glanced over the std.stdio code... it appears that 
> somebody has added @trusted all over the place, probably just 
> to get it to compile with @safe.  That's kinda scary... 
> somebody needs to vet this code carefully to make sure nothing 
> fishy's going on in there!
> T

I can replace it with core.stdc.stdio if it's any better. Looks 
like any attempt to do a check for "x is null" hides the bug. I 
tried assert(), also tried if (x is null) throw new Exception(...)

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