tor-browser

The Tor Browser
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global-switch-dflt-eval-global-block-scoping.js (1588B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/annex-b-fns/eval-global-block-scoping.case
      3 // - src/annex-b-fns/eval-global/direct-switch-dflt.template
      4 /*---
      5 description: A block-scoped binding is created (Funtion declaration in the `default` clause of a `switch` statement in eval code in the global scope)
      6 esid: sec-web-compat-evaldeclarationinstantiation
      7 flags: [generated, noStrict]
      8 info: |
      9    13.2.14 Runtime Semantics: BlockDeclarationInstantiation
     10 
     11    [...]
     12    4. For each element d in declarations do
     13       a. For each element dn of the BoundNames of d do
     14          i. If IsConstantDeclaration of d is true, then
     15             [...]
     16          ii. Else,
     17              2. Perform ! envRec.CreateMutableBinding(dn, false).
     18 
     19       b. If d is a GeneratorDeclaration production or a FunctionDeclaration
     20          production, then
     21          i. Let fn be the sole element of the BoundNames of d.
     22          ii. Let fo be the result of performing InstantiateFunctionObject for
     23              d with argument env.
     24          iii. Perform envRec.InitializeBinding(fn, fo). 
     25 ---*/
     26 var initialBV, currentBV;
     27 
     28 eval(
     29  'switch (1) {' +
     30  '  default:' +
     31  '    function f() { initialBV = f; f = 123; currentBV = f; return "decl"; }' +
     32  '}\
     33  '
     34 );
     35 
     36 f();
     37 
     38 assert.sameValue(
     39  initialBV(),
     40  'decl',
     41  'Block-scoped binding value is function object at execution time'
     42 );
     43 assert.sameValue(currentBV, 123, 'Block-scoped binding is mutable');
     44 assert.sameValue(
     45  f(),
     46  'decl',
     47  'Block-scoped binding is independent of outer var-scoped binding'
     48 );
     49 
     50 reportCompare(0, 0);