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Editorial: Fix return value logic for async arrow functions #1406

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Jan 23, 2020
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Editorial: Fix return value logic for async arrow functions #1406

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51 changes: 24 additions & 27 deletions spec.html
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Original file line number Diff line number Diff line change
Expand Up @@ -19825,8 +19825,11 @@ <h2>Syntax</h2>
CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await] #parencover

ConciseBody[In] :
[lookahead != `{` ] AssignmentExpression[?In, ~Yield, ~Await]
[lookahead != `{` ] ExpressionBody[?In, ~Await]
`{` FunctionBody[~Yield, ~Await] `}`

ExpressionBody[In, Await] :
AssignmentExpression[?In, ~Yield, ?Await]
</emu-grammar>
<h2>Supplemental Syntax</h2>
<p>When the production
Expand Down Expand Up @@ -19909,7 +19912,7 @@ <h1>Static Semantics: ContainsExpression</h1>
<emu-clause id="sec-arrow-function-definitions-static-semantics-containsusestrict">
<h1>Static Semantics: ContainsUseStrict</h1>
<emu-see-also-para op="ContainsUseStrict"></emu-see-also-para>
<emu-grammar>ConciseBody : AssignmentExpression</emu-grammar>
<emu-grammar>ConciseBody : ExpressionBody</emu-grammar>
<emu-alg>
1. Return *false*.
</emu-alg>
Expand Down Expand Up @@ -19970,7 +19973,7 @@ <h1>Static Semantics: CoveredFormalsList</h1>
<emu-clause id="sec-arrow-function-definitions-static-semantics-lexicallydeclarednames">
<h1>Static Semantics: LexicallyDeclaredNames</h1>
<emu-see-also-para op="LexicallyDeclaredNames"></emu-see-also-para>
<emu-grammar>ConciseBody : AssignmentExpression</emu-grammar>
<emu-grammar>ConciseBody : ExpressionBody</emu-grammar>
<emu-alg>
1. Return a new empty List.
</emu-alg>
Expand All @@ -19979,7 +19982,7 @@ <h1>Static Semantics: LexicallyDeclaredNames</h1>
<emu-clause id="sec-arrow-function-definitions-static-semantics-lexicallyscopeddeclarations">
<h1>Static Semantics: LexicallyScopedDeclarations</h1>
<emu-see-also-para op="LexicallyScopedDeclarations"></emu-see-also-para>
<emu-grammar>ConciseBody : AssignmentExpression</emu-grammar>
<emu-grammar>ConciseBody : ExpressionBody</emu-grammar>
<emu-alg>
1. Return a new empty List.
</emu-alg>
Expand All @@ -19988,7 +19991,7 @@ <h1>Static Semantics: LexicallyScopedDeclarations</h1>
<emu-clause id="sec-arrow-function-definitions-static-semantics-vardeclarednames">
<h1>Static Semantics: VarDeclaredNames</h1>
<emu-see-also-para op="VarDeclaredNames"></emu-see-also-para>
<emu-grammar>ConciseBody : AssignmentExpression</emu-grammar>
<emu-grammar>ConciseBody : ExpressionBody</emu-grammar>
<emu-alg>
1. Return a new empty List.
</emu-alg>
Expand All @@ -19997,7 +20000,7 @@ <h1>Static Semantics: VarDeclaredNames</h1>
<emu-clause id="sec-arrow-function-definitions-static-semantics-varscopeddeclarations">
<h1>Static Semantics: VarScopedDeclarations</h1>
<emu-see-also-para op="VarScopedDeclarations"></emu-see-also-para>
<emu-grammar>ConciseBody : AssignmentExpression</emu-grammar>
<emu-grammar>ConciseBody : ExpressionBody</emu-grammar>
<emu-alg>
1. Return a new empty List.
</emu-alg>
Expand Down Expand Up @@ -20030,12 +20033,10 @@ <h1>Runtime Semantics: IteratorBindingInitialization</h1>
<h1>Runtime Semantics: EvaluateBody</h1>
<p>With parameters _functionObject_ and List _argumentsList_.</p>
<emu-see-also-para op="EvaluateBody"></emu-see-also-para>
<emu-grammar>ConciseBody : AssignmentExpression</emu-grammar>
<emu-grammar>ConciseBody : ExpressionBody</emu-grammar>
<emu-alg>
1. Perform ? FunctionDeclarationInstantiation(_functionObject_, _argumentsList_).
1. Let _exprRef_ be the result of evaluating |AssignmentExpression|.
1. Let _exprValue_ be ? GetValue(_exprRef_).
1. Return Completion { [[Type]]: ~return~, [[Value]]: _exprValue_, [[Target]]: ~empty~ }.
1. Return the result of evaluating |ExpressionBody|.
</emu-alg>
</emu-clause>

Expand Down Expand Up @@ -20063,6 +20064,12 @@ <h1>Runtime Semantics: Evaluation</h1>
<emu-note>
<p>An |ArrowFunction| does not define local bindings for `arguments`, `super`, `this`, or `new.target`. Any reference to `arguments`, `super`, `this`, or `new.target` within an |ArrowFunction| must resolve to a binding in a lexically enclosing environment. Typically this will be the Function Environment of an immediately enclosing function. Even though an |ArrowFunction| may contain references to `super`, the function object created in step 3 is not made into a method by performing MakeMethod. An |ArrowFunction| that references `super` is always contained within a non-|ArrowFunction| and the necessary state to implement `super` is accessible via the _scope_ that is captured by the function object of the |ArrowFunction|.</p>
</emu-note>
<emu-grammar>ExpressionBody : AssignmentExpression</emu-grammar>
<emu-alg>
1. Let _exprRef_ be the result of evaluating |AssignmentExpression|.
1. Let _exprValue_ be ? GetValue(_exprRef_).
1. Return Completion { [[Type]]: ~return~, [[Value]]: _exprValue_, [[Target]]: ~empty~ }.
</emu-alg>
</emu-clause>
</emu-clause>

Expand Down Expand Up @@ -21541,7 +21548,7 @@ <h2>Syntax</h2>
CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await] [no LineTerminator here] `=>` AsyncConciseBody[?In] #callcover

AsyncConciseBody[In] :
[lookahead != `{`] AssignmentExpression[?In, ~Yield, +Await]
[lookahead != `{`] ExpressionBody[?In, +Await]
`{` AsyncFunctionBody `}`

AsyncArrowBindingIdentifier[Yield] :
Expand Down Expand Up @@ -21683,7 +21690,7 @@ <h1>Static Semantics: IsSimpleParameterList</h1>
<emu-clause id="sec-async-arrow-function-definitions-static-semantics-LexicallyDeclaredNames">
<h1>Static Semantics: LexicallyDeclaredNames</h1>
<emu-grammar>
AsyncConciseBody : AssignmentExpression
AsyncConciseBody : ExpressionBody
</emu-grammar>
<emu-alg>
1. Return a new empty List.
Expand All @@ -21693,7 +21700,7 @@ <h1>Static Semantics: LexicallyDeclaredNames</h1>
<emu-clause id="sec-async-arrow-function-definitions-static-semantics-LexicallyScopedDeclarations">
<h1>Static Semantics: LexicallyScopedDeclarations</h1>
<emu-grammar>
AsyncConciseBody : AssignmentExpression
AsyncConciseBody : ExpressionBody
</emu-grammar>
<emu-alg>
1. Return a new empty List.
Expand All @@ -21703,7 +21710,7 @@ <h1>Static Semantics: LexicallyScopedDeclarations</h1>
<emu-clause id="sec-async-arrow-function-definitions-static-semantics-VarDeclaredNames">
<h1>Static Semantics: VarDeclaredNames</h1>
<emu-grammar>
AsyncConciseBody : AssignmentExpression
AsyncConciseBody : ExpressionBody
</emu-grammar>
<emu-alg>
1. Return a new empty List.
Expand All @@ -21713,7 +21720,7 @@ <h1>Static Semantics: VarDeclaredNames</h1>
<emu-clause id="sec-async-arrow-function-definitions-static-semantics-VarScopedDeclarations">
<h1>Static Semantics: VarScopedDeclarations</h1>
<emu-grammar>
AsyncConciseBody : AssignmentExpression
AsyncConciseBody : ExpressionBody
</emu-grammar>
<emu-alg>
1. Return a new empty List.
Expand Down Expand Up @@ -21745,23 +21752,17 @@ <h1>Runtime Semantics: IteratorBindingInitialization</h1>
<h1>Runtime Semantics: EvaluateBody</h1>
<p>With parameters _functionObject_ and List _argumentsList_.</p>
<emu-grammar>
AsyncConciseBody : AssignmentExpression
AsyncConciseBody : ExpressionBody
</emu-grammar>
<emu-alg>
1. Let _promiseCapability_ be ! NewPromiseCapability(%Promise%).
1. Let _declResult_ be FunctionDeclarationInstantiation(_functionObject_, _argumentsList_).
1. If _declResult_ is not an abrupt completion, then
1. Perform ! AsyncFunctionStart(_promiseCapability_, |AssignmentExpression|).
1. Perform ! AsyncFunctionStart(_promiseCapability_, |ExpressionBody|).
1. Else,
1. Perform ! Call(_promiseCapability_.[[Reject]], *undefined*, &laquo; _declResult_.[[Value]] &raquo;).
1. Return Completion { [[Type]]: ~return~, [[Value]]: _promiseCapability_.[[Promise]], [[Target]]: ~empty~ }.
</emu-alg>
<emu-grammar>
AsyncConciseBody : `{` AsyncFunctionBody `}`
</emu-grammar>
<emu-alg>
1. Return the result of EvaluateBody of |AsyncFunctionBody| passing _functionObject_ and _argumentsList_ as the arguments.
</emu-alg>
</emu-clause>

<emu-clause id="sec-async-arrow-function-definitions-runtime-semantics-namedevaluation">
Expand Down Expand Up @@ -21836,10 +21837,6 @@ <h1>Static Semantics: HasCallInTailPosition</h1>

<emu-clause id="sec-statement-rules">
<h1>Statement Rules</h1>
<emu-grammar>ConciseBody : AssignmentExpression</emu-grammar>
<emu-alg>
1. Return HasCallInTailPosition of |AssignmentExpression| with argument _call_.
</emu-alg>
<emu-grammar>StatementList : StatementList StatementListItem</emu-grammar>
<emu-alg>
1. Let _has_ be HasCallInTailPosition of |StatementList| with argument _call_.
Expand Down