| // This file was procedurally generated from the following sources: |
| // - src/dstr-binding/ary-ptrn-rest-ary-empty.case |
| // - src/dstr-binding/default/gen-func-decl.template |
| /*--- |
| description: Rest element containing an "empty" array pattern (generator function declaration) |
| esid: sec-generator-function-definitions-runtime-semantics-instantiatefunctionobject |
| features: [generators, destructuring-binding] |
| flags: [generated] |
| info: | |
| GeneratorDeclaration : function * ( FormalParameters ) { GeneratorBody } |
| |
| [...] |
| 2. Let F be GeneratorFunctionCreate(Normal, FormalParameters, |
| GeneratorBody, scope, strict). |
| [...] |
| |
| 9.2.1 [[Call]] ( thisArgument, argumentsList) |
| |
| [...] |
| 7. Let result be OrdinaryCallEvaluateBody(F, argumentsList). |
| [...] |
| |
| 9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList ) |
| |
| 1. Let status be FunctionDeclarationInstantiation(F, argumentsList). |
| [...] |
| |
| 9.2.12 FunctionDeclarationInstantiation(func, argumentsList) |
| |
| [...] |
| 23. Let iteratorRecord be Record {[[iterator]]: |
| CreateListIterator(argumentsList), [[done]]: false}. |
| 24. If hasDuplicates is true, then |
| [...] |
| 25. Else, |
| b. Let formalStatus be IteratorBindingInitialization for formals with |
| iteratorRecord and env as arguments. |
| [...] |
| |
| 13.3.3.6 Runtime Semantics: IteratorBindingInitialization |
| |
| BindingRestElement : ... BindingPattern |
| |
| 1. Let A be ArrayCreate(0). |
| [...] |
| 3. Repeat |
| [...] |
| b. If iteratorRecord.[[done]] is true, then |
| i. Return the result of performing BindingInitialization of |
| BindingPattern with A and environment as the arguments. |
| [...] |
| |
| 13.3.3.6 Runtime Semantics: IteratorBindingInitialization |
| |
| ArrayBindingPattern : [ ] |
| |
| 1. Return NormalCompletion(empty). |
| |
| ---*/ |
| var iterations = 0; |
| var iter = function*() { |
| iterations += 1; |
| }(); |
| |
| var callCount = 0; |
| function* f([...[]]) { |
| assert.sameValue(iterations, 1); |
| callCount = callCount + 1; |
| }; |
| f(iter).next(); |
| assert.sameValue(callCount, 1, 'generator function invoked exactly once'); |