When compiling a for-loop local variable initializer expression, the compiler
   incorrectly treated subsequent declarations as global variable assignments,
   triggering reference error exceptions in strict mode.
   
   -- Expect stdout --
   1
   -- End --
   
   -- Testcase --
  {%
          "use strict";
  
          // The initializer expression below was incorrectly interpreted as
          // `let x = 0; y = 1` instead of the correct `let ..., y = 1`.
          for (let x = 0, y = 1; x < 1; x++)
                  print(y, "\n");
  %}
  -- End --

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