extract map copying logic to a separate function
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@ -3651,9 +3651,7 @@ module ts {
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var maybeCache = maybeStack[depth];
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// If result is definitely true, copy assumptions to global cache, else copy to next level up
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var destinationCache = result === Ternary.True || depth === 0 ? relation : maybeStack[depth - 1];
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for (var p in maybeCache) {
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destinationCache[p] = maybeCache[p];
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}
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copyMap(maybeCache, destinationCache);
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}
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else {
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// A false result goes straight into global cache (when something is false under assumptions it
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@ -208,6 +208,12 @@ module ts {
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return result;
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}
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export function copyMap<T>(source: Map<T>, target: Map<T>): void {
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for (var p in source) {
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target[p] = source[p];
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}
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}
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/**
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* Creates a map from the elements of an array.
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*
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