10.2 Types of Source Code [...] Function code is source text that is parsed to supply the value of the [[ECMAScriptCode]] and [[FormalParameters]] internal slots (see 9.2) of an ECMAScript function object. [...]
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10.2 Types of Source Code (amended) [...] Function code is source text that is parsed to supply the value of the [[ECMAScriptCode]] and [[FormalParameters]] internal slots (see 9.2) of an ECMAScript function object, along with the BindingIdentifier of FunctionExpressions, GeneratorExpressions, and AsyncFunctionExpressions (if present). [...]