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describe "using", ->
it "should prevent variable shadowing in assignment", ->
tmp = 100
i, k = 100, 50
process = (add using k, i) ->
tmp = tmp + add
i += tmp
k += tmp
process 22
assert.same i, 222
assert.same k, 172
assert.same tmp, 100
it "should handle multiple variable names", ->
a, b, c = 1, 2, 3
process = (sum using a, b) ->
a += 1
b += 2
c = sum + 100
process 10
assert.same a, 2
assert.same b, 4
assert.same c, 3
it "should work with nil value", ->
local x = 1
fn = (val using x) ->
if val ~= nil
x = val
fn 100
assert.same x, 100
assert.is_true x ~= 1
it "should work with function calls", ->
local count = 0
fn = (n using count) ->
count += n
fn 5
assert.same count, 5
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