Source code
Revision control
Copy as Markdown
Other Tools
// |reftest| async
// This file was procedurally generated from the following sources:
// - src/function-forms/dflt-params-ref-prior.case
// - src/function-forms/default/async-gen-named-func-expr.template
/*---
description: Referencing a parameter that occurs earlier in the ParameterList (async generator named function expression)
esid: sec-asyncgenerator-definitions-evaluation
features: [default-parameters, async-iteration]
flags: [generated, async]
info: |
AsyncGeneratorExpression : async [no LineTerminator here] function * BindingIdentifier
( FormalParameters ) { AsyncGeneratorBody }
[...]
7. Let closure be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters,
AsyncGeneratorBody, funcEnv, strict).
[...]
14.1.19 Runtime Semantics: IteratorBindingInitialization
FormalsList : FormalsList , FormalParameter
1. Let status be the result of performing IteratorBindingInitialization for
FormalsList using iteratorRecord and environment as the arguments.
2. ReturnIfAbrupt(status).
3. Return the result of performing IteratorBindingInitialization for
FormalParameter using iteratorRecord and environment as the arguments.
---*/
var x = 0;
var callCount = 0;
// Stores a reference `ref` for case evaluation
var ref;
ref = async function* g(x, y = x, z = y) {
assert.sameValue(x, 3, 'first argument value');
assert.sameValue(y, 3, 'second argument value');
assert.sameValue(z, 3, 'third argument value');
callCount = callCount + 1;
};
ref(3).next().then(() => {
assert.sameValue(callCount, 1, 'generator function invoked exactly once');
}).then($DONE, $DONE);