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--TEST--
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SSA narrowing: reference assignment prevents narrowing
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--FILE--
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<?php
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function main(): void {
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$a = 100;
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$b = &$a;
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$a = 200;
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echo $b, PHP_EOL;
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// $c is not referenced; arithmetic still keeps PHP runtime semantics.
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$c = 50;
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$c += 25;
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echo $c, PHP_EOL;
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}
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?>
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--EXPECT--
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200
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75
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