Module level variable shadowing

[Walter Bright via Digitalmars-d]

On 6/25/2014 4:03 PM, bearophile wrote:
> The simplest way to avoid that kind of bugs is give a "shadowing global x error"
> (similar to the shadowing errors D gives with foreach and with statements). But
> this breaks most existing D code.

D has scoped lookup. Taking your proposal as principle, where do we stop at 
issuing errors when there is the same identifier in multiple in-scope scopes? I 
think we hit the sweet spot at restricting shadowing detection to local scopes.

I suggest that your issues with global variables can be mitigated by adopting a 
distinct naming convention for your globals. Frankly, I think a global variable 
named "x" is execrable style - such short names should be reserved for locals.