module hijacking

[hasenj]

Andrei Alexandrescu wrote:
> I ran the following experiment:
> 
> mkdir deleteme
> cd deleteme
> mkdir std
> touch std/algorithm.d
> echo 'import std.algorithm; void main(){int a, b;swap(a,b);}' >main.d
> dmd main
> 
> The attempt to compile main fails with "undefined identifier swap", 
> which means that the module I defined in the current directory 
> successfully hijacked the one in the standard library.
> 
> The usual D spirit is that a symbol is searched exhaustively, and 
> attempts at hijacking are denounced. In the module cases, it turns out 
> that an entire module can successfully hijack another.
> 
> Walter and I are ambivalent about this. There has been no bug report so 
> it seems like people didn't have a problem with things working as they 
> are. But maybe they never hijacked, or maybe some did hijack.
> 
> Question: should we change this?
> 
> 
> Andrei

This is also possible in python.

Has this ever caused a real problem? or is it just a theoretical problem?