Description:
------------
Namespace aliases do not work only inside trait's use block. If provide fully 
qualified namespace then example works fine:
class A {
  use T1, T2 {
    \N1\T1::hello insteadof \N1\T2;
  }
}

Test script:
---------------
<?php

namespace N1 {

    trait T1 {
      public function hello() { return 'hello from t1'; }
    }

    trait T2 {
      public function hello() { return 'hello from t2'; }
    }

}

namespace N2 {

    use N1\T1;
    use N1\T2;
    
    class A {
      use T1, T2 {
        T1::hello insteadof T2;
      }
    }

    $a = new A;
    echo $a->hello(), PHP_EOL;
    
}

Expected result:
----------------
hello from t1

Actual result:
--------------
PHP Fatal error:  Trait 'T1' not found in test_script.php on line 24