variant overwrited in loops

[sssbit]

foo = 'globalvar'

bar = do ->
for foo in [1..5]
alert foo

alert foo # -> 6

the variant 'foo' in that function will overwrite the "foo = 'globalvar'".
so i think we alway need to create the local 'foo' var in "for foo in ..", "for foo of .." regardless of the 'foo' variant has been defined before.

[davidchambers]

You shouldn't be shadowing variables. Jeremy has said this many times and I agree. Things that are different should have different names.

[davidchambers]

See, for example, #2697.