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BestFirstSearch: don't retry if didn't optimize #1738

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Feb 24, 2020
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Original file line number Diff line number Diff line change
Expand Up @@ -253,7 +253,7 @@ private class BestFirstSearch private (
val state = {
def run = shortestPath(State.start, tree.tokens.last)
val state = run
if (null != state) state
if (null != state || keepSlowStates) state
else {
best.clear()
keepSlowStates = true
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