Could JEP 468 support a single expression?

[Stephen Colebourne]

I believe that many, if not most, uses of derived record creation
expressions will have a single assignment. Has consideration been
given to allowing a single assignment expression instead of a block?

eg this:
  record Complex(double re, double im) {
    Complex conjugate() { return this with { im = -im; }; }
    Complex realOnly()  { return this with { im = 0; }; }
    Complex imOnly()    { return this with { re = 0; }; }
  }

becomes:
  record Complex(double re, double im) {
    Complex conjugate() { return this with im = -im; }
    Complex realOnly()  { return this with im = 0; }
    Complex imOnly()    { return this with re = 0; }
  }

In general, I think this JEP is OK, but it doesn't move the needle
much without a mechanism to create the record in a similar way.

Stephen