JSTests/test262/test/language/expressions/generators/dstr/dflt-ary-ptrn-rest-not-final-ary.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/ary-ptrn-rest-not-final-ary.case
// - src/dstr-binding/default/gen-func-expr-dflt.template
/*---
description: Rest element (array binding pattern) may not be followed by any element (generator function expression (default parameter))
esid: sec-generator-function-definitions-runtime-semantics-evaluation
features: [generators, destructuring-binding, default-parameters]
flags: [generated]
negative:
  phase: parse
  type: SyntaxError
info: |
    GeneratorExpression : function * ( FormalParameters ) { GeneratorBody }

        [...]
        3. Let closure 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 Destructuring Binding Patterns
    ArrayBindingPattern[Yield] :
        [ Elisionopt BindingRestElement[?Yield]opt ]
        [ BindingElementList[?Yield] ]
        [ BindingElementList[?Yield] , Elisionopt BindingRestElement[?Yield]opt ]
---*/
$DONOTEVALUATE();

var callCount = 0;
var f;
f = function*([...[x], y] = [1, 2, 3]) {
  
  callCount = callCount + 1;
};

f().next();
assert.sameValue(callCount, 1, 'generator function invoked exactly once');