why does this not halt?

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Apr 19, 2012, 7:23:55 AM4/19/12

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i:1;while[~i=3;{x::y}[`i;3]]

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Apr 19, 2012, 8:14:55 AM4/19/12

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because it is setting local x to 3.

inside a function, :: sets global when the local is not defined.

here x is implicit arg.

use set instead

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