v8/test/mjsunit/regress/regress-91120.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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// With ES2015 function hoisting semantics, functions are only "hoisted" out
// of blocks by writing their values into var-scoped declarations. Therefore,
// they access the catch binding when it syntactically appears so.
// This is a potentially breaking change vs the old semantics, which would
// return 'function' from g() everywhere.

var x = 'global';

function f() {
  var x = 'function';
  assertEquals(undefined, g);
  try {
    assertEquals(undefined, g);
    throw 'catch';
  } catch (x) {
    function g() { return x; }
    assertEquals('catch', g());
  }
  assertEquals('catch', g());
  return g;
}

assertEquals('catch', f()());