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Editorial: FunctionDeclarationInstantiation cannot return ReturnCompletion #3607

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Jun 27, 2025
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Editorial: FunctionDeclarationInstantiation cannot return ReturnCompletion #3607

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1 change: 1 addition & 0 deletions esmeta-ignore.json
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
"DoWait",
"EvaluateImportCall",
"FinishLoadingImportedModule",
"FunctionDeclarationInstantiation",
"FunctionBody[0,0].EvaluateFunctionBody",
"GetViewByteLength",
"INTRINSICS.Atomics.notify",
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8 changes: 5 additions & 3 deletions spec.html
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Expand Up @@ -13848,7 +13848,7 @@ <h1>
FunctionDeclarationInstantiation (
_func_: an ECMAScript function object,
_argumentsList_: a List of ECMAScript language values,
): either a normal completion containing ~unused~ or an abrupt completion
): either a normal completion containing ~unused~ or a throw completion
</h1>
<dl class="header">
<dt>description</dt>
Expand Down Expand Up @@ -13927,9 +13927,11 @@ <h1>
1. Let _parameterBindings_ be _parameterNames_.
1. Let _iteratorRecord_ be CreateListIteratorRecord(_argumentsList_).
1. If _hasDuplicates_ is *true*, then
1. Perform ? IteratorBindingInitialization of _formals_ with arguments _iteratorRecord_ and *undefined*.
1. Let _usedEnv_ be *undefined*.
1. Else,
1. Perform ? IteratorBindingInitialization of _formals_ with arguments _iteratorRecord_ and _env_.
1. Let _usedEnv_ be _env_.
1. NOTE: The following step cannot return a ReturnCompletion because the only way such a completion can arise in expression position is by use of |YieldExpression|, which is forbidden in parameter lists by Early Error rules in <emu-xref href="#sec-generator-function-definitions-static-semantics-early-errors"></emu-xref> and <emu-xref href="#sec-async-generator-function-definitions-static-semantics-early-errors"></emu-xref>.
1. Perform ? IteratorBindingInitialization of _formals_ with arguments _iteratorRecord_ and _usedEnv_.
1. If _hasParameterExpressions_ is *false*, then
1. NOTE: Only a single Environment Record is needed for the parameters and top-level vars.
1. Let _instantiatedVarNames_ be a copy of the List _parameterBindings_.
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