tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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switch-dflt-func-block-scoping.js (1595B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/annex-b-fns/func-block-scoping.case
      3 // - src/annex-b-fns/func/switch-dflt.template
      4 /*---
      5 description: A block-scoped binding is created (Funtion declaration in the `default` clause of a `switch` statement in function scope)
      6 esid: sec-web-compat-functiondeclarationinstantiation
      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, varBinding;
     27 
     28 (function() {
     29  
     30 
     31  switch (1) {
     32    default:
     33      function f() { initialBV = f; f = 123; currentBV = f; return 'decl'; }
     34  }
     35 
     36  varBinding = f;
     37  f();
     38 }());
     39 
     40 
     41 assert.sameValue(
     42  initialBV(),
     43  'decl',
     44  'Block-scoped binding value is function object at execution time'
     45 );
     46 assert.sameValue(currentBV, 123, 'Block-scoped binding is mutable');
     47 assert.sameValue(
     48  varBinding(),
     49  'decl',
     50  'Block-scoped binding is independent of outer var-scoped binding'
     51 );
     52 
     53 reportCompare(0, 0);