local import hijacking

[Byron Heads via Digitalmars-d]

On Thursday, 14 January 2016 at 14:56:39 UTC, Byron Heads wrote:
> On Thursday, 14 January 2016 at 14:36:23 UTC, Daniel Kozak 
> wrote:
>> [...]
>
>
>
> import std.experimental.logger;
> void foo() {
>  	import std.net.curl;
>
>         .... lots of curl calls
>
>  	trace("hello");
>
>         .. more curl calls
> }
>
>
> void main() {
> 	foo();
> }
>
> std.net.curl.CurlException at std\net\curl.d(4033): Couldn't 
> resolve host name on handle 2188398
> ----------------
> 0x00405F65
> 0x00405F10
> 0x0040275B
> 0x0040259E
> 0x0040202B
> 0x00402035
> 0x004257A7
> 0x004256A8
> 0x0041B7FF
> 0x769F337A in BaseThreadInitThunk
> 0x77429882 in RtlInitializeExceptionChain
> 0x77429855 in RtlInitializeExceptionChain
>
> This was a 4 hour debug which made it worse as I was adding 
> more trace calls to figure out what was going on.  My boss is 
> now on the fence, to many compiler bugs with D, he asked me to 
> switch to Java if I have to deal to many more issues like 
> this.. (https://issues.dlang.org/show_bug.cgi?id=15457  another 
> issue we had)
>
> And this awesome stack trace helped me so much to track this 
> issue down...


Also why is this not allowed then?

import std.stdio;
void main() {
   auto x = "foo";
   for(int x = 0; x < 10; ++x) {
      writeln(x);
   }
}

Error: variable x is shadowing variable f335.main.x

Shadowing is bad and leads to bugs!