[dcl.fct.def.general] p2 "declarator;" is not described in [dcl.fct]

[dcl.fct.def.general] p2 says

In a function-definition, either void declarator ; or declarator ; shall be a well-formed function declaration as described in [dcl.fct].

The latter form declarator ; presumably refers to the declaration of a constructor or destructor. However, it is not described in [dcl.fct]. In [dcl.fct], the declaration described in either [dcl.fct] p1 or p2 should have the form T D; where T should comprise a valid type since the function type "returning T", in either form. This option has confirmed in https://github.com/cplusplus/draft/pull/4737#discussion_r785042207

Constructors / destructors don't have a return type in the "function declaration" sense, and that absence makes "return something" syntactically ill-formed.

So, for the latter case, it should cross-reference [class.ctor] and [class.dtor] instead of [dcl.fct].

Start with [dcl.fct.def.general] p2 and compare the declaration forms described in [dcl.fct] p1-p2. Check [class.ctor] and [class.dtor] for the appropriate constructor and destructor wording. Done means the latter form is cross-referenced to those clauses rather than [dcl.fct].