Ensure that `as` and `from` are valid identifiers while their special
   meaning in import statements is retained.
   
   -- Testcase --
   import { foo as bar } from 'mod';
   import * as mod from 'mod';
   
   function fn(as, from) {
           return as + from;
  }
  
  as = 1;
  from = true;
  
  printf("%.J\n", [
          bar,
          mod,
          fn(1, 2),
          as,
          from
  ]);
  -- End --
  
  -- File mod.uc --
  export let foo = false;
  export default 'test';
  -- End --
  
  -- Args --
  -R -L files/
  -- End --
  
  -- Expect stdout --
  [
          false,
          {
                  "foo": false,
                  "default": "test"
          },
          3,
          1,
          true
  ]
  -- End --

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