I didn't understand the change proposed in DR 2145 for [dcl.fct.def.general]/2

Question

The change proposed in DR 2145 was responsible for the change in [dcl.fct.def.general]/2 from C++14 to C++17, as follows:

C++14:

The declarator in a function-definition shall have the form
      D1 ( parameter-declaration-clause ) cv-qualifier-seq_opt ref-qualifier_opt
             exception-specification_opt attribute-specifier-seq_opt trailing-return-type_opt
as described in 8.3.5. A function shall be defined only in namespace or class scope.

C++17:

In a function-definition, either void declarator ; or declarator ; shall be a well-formed function declaration as described in 11.3.5. A function shall be defined only in namespace or class scope.

Frankly, I didn't understand the motivation for the change, neither the new wording in C++17.

Answer 1

As T.C. pointed out in the comment,

The intention is to allow stuff like int (f()) { return 1; } which is banned by the previous wording but allowed in practice.