Description:
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In use statement we can use "," to separate aliased namespaces but the alias only affect to the last one declared use namespace. It'll be logical to use all declared namespaces in alias and use classes/constants/closures/etc. from aliased namespace where they exists.

Test script:
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<?

namespace A;
class test1 {}
class test2 {}

namespace B;
class test1 {}

use A, B as Foo;

$test1 = new Foo\test1;
echo get_class($test1). "\n";
$test2 = new Foo\test2;
echo get_class($test2). "\n";

Expected result:
----------------
B\test1
A\test2


Actual result:
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B\test1
PHP Fatal error:  Class 'B\test2' not found in test.php on line 13