rust/src/test/run-pass/block-iter-2.rs

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fn iter_vec[T](v: &[T], f: &block(&T) ) { for x: T in v { f(x); } }
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fn main() {
let v = ~[1, 2, 3, 4, 5];
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let sum = 0;
iter_vec(v,
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{|&i|
iter_vec(v, {|&j| log_err i * j; sum += i * j; });
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});
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log_err sum;
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assert (sum == 225);
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}