tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

if-decl-else-decl-b-func-no-skip-try.js (2026B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/annex-b-fns/func-no-skip-try.case
      3 // - src/annex-b-fns/func/if-decl-else-decl-b.template
      4 /*---
      5 description: Extension is observed when creation of variable binding would not produce an early error (try statement) (IfStatement with a declaration in both statement positions in function scope)
      6 esid: sec-functiondeclarations-in-ifstatement-statement-clauses
      7 flags: [generated, noStrict]
      8 info: |
      9    The following rules for IfStatement augment those in 13.6:
     10 
     11    IfStatement[Yield, Return]:
     12        if ( Expression[In, ?Yield] ) FunctionDeclaration[?Yield] else Statement[?Yield, ?Return]
     13        if ( Expression[In, ?Yield] ) Statement[?Yield, ?Return] else FunctionDeclaration[?Yield]
     14        if ( Expression[In, ?Yield] ) FunctionDeclaration[?Yield] else FunctionDeclaration[?Yield]
     15        if ( Expression[In, ?Yield] ) FunctionDeclaration[?Yield]
     16 
     17 
     18    B.3.3.1 Changes to FunctionDeclarationInstantiation
     19 
     20    [...]
     21    2. If instantiatedVarNames does not contain F, then
     22       a. Perform ! varEnvRec.CreateMutableBinding(F, false).
     23       b. Perform varEnvRec.InitializeBinding(F, undefined).
     24       c. Append F to instantiatedVarNames.
     25    [...]
     26 
     27    B.3.5 VariableStatements in Catch Blocks
     28 
     29    [...]
     30    - It is a Syntax Error if any element of the BoundNames of CatchParameter
     31      also occurs in the VarDeclaredNames of Block unless CatchParameter is
     32      CatchParameter:BindingIdentifier and that element is only bound by a
     33      VariableStatement, the VariableDeclarationList of a for statement, or the
     34      ForBinding of a for-in statement.
     35 ---*/
     36 
     37 (function() {
     38  assert.sameValue(
     39    f, undefined, 'Initialized binding created prior to evaluation'
     40  );
     41 
     42  try {
     43    throw null;
     44  } catch (f) {
     45 
     46  if (false) function _f() {} else function f() { return 123; }
     47 
     48  }
     49 
     50  assert.sameValue(
     51    typeof f,
     52    'function',
     53    'binding value is updated following evaluation'
     54  );
     55  assert.sameValue(f(), 123);
     56 }());
     57 
     58 reportCompare(0, 0);