| // This file was procedurally generated from the following sources: |
| // - src/dstr-binding/ary-ptrn-rest-id.case |
| // - src/dstr-binding/default/gen-func-decl.template |
| /*--- |
| description: Lone rest element (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 : ... BindingIdentifier |
| [...] 3. Let A be ArrayCreate(0). [...] 5. Repeat |
| [...] |
| f. Let status be CreateDataProperty(A, ToString (n), nextValue). |
| [...] |
| ---*/ |
| var values = [1, 2, 3]; |
| |
| var callCount = 0; |
| function* f([...x]) { |
| assert(Array.isArray(x)); |
| assert.sameValue(x.length, 3); |
| assert.sameValue(x[0], 1); |
| assert.sameValue(x[1], 2); |
| assert.sameValue(x[2], 3); |
| assert.notSameValue(x, values); |
| callCount = callCount + 1; |
| }; |
| f(values).next(); |
| assert.sameValue(callCount, 1, 'generator function invoked exactly once'); |