[JavaScript] anonymousFunction shouldn't contain functionDeclaration

[ris58h]

The rules below are from the current JavaScriptParser.g4:

anonymousFunction
    : functionDeclaration                                                       # FunctionDecl
    | Async? Function_ '*'? '(' formalParameterList? ')' functionBody    # AnonymousFunctionDecl
    | Async? arrowFunctionParameters '=>' arrowFunctionBody                     # ArrowFunction
    ;

functionDeclaration
    : Async? Function_ '*'? identifier '(' formalParameterList? ')' functionBody
    ;

It seems like functionDeclaration shouldn't be a part of anonymousFunction. First of all it is clearly not anonymous. Also such rules produce a complex tree for a named async function: for code async function fetchNext(continuation) {} the statement subtree is (expressionStatement (expressionSequence (singleExpression (anonymousFunction (functionDeclaration ...)))) instead of just (functionDeclaration ...)