[Swift-devel] multiple declarations of variables.

[Ben Clifford]

At present, the language allows multiple declarations using the same 
variable name resulting in the second variable shadowing the first.

eg:

> file i;
> file i;

(which is fairly obvious)

but also:

> file foo <"myfile">;
> file foo = f(x);

I've seen multiple declarations like this confuse a few people in that 
past.

I'd like to make variable shadowing illegal - either of the above should 
result in a compile time error (or at least a warning).

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