E01086: aggregate member out of order - EK9 requires: properties first, then methods, then operators (a bare 'default operator' last)

What went wrong

A member of an aggregate body (class, record, trait, component or dynamic class) is out of the order EK9 requires:

Properties (fields) first
Constructors and methods second
Operators third, in any order among themselves ('default operator X' is one)
A bare 'default operator' (generate every operator) is the LAST item of all

The compiler reports the FIRST member out of that order, once per body, on the member itself: a method or property after an operator, a property after a method, or anything after a bare 'default operator'. The failing source in the [EXAMPLE] section below (bad.ek9) declares 'describe()' after 'default operator ?'.

Worked examples

Compilable examples demonstrating this error and the correct fix:

ek9 -q 1097 (Create a Product class with full operator support in o...)

Common causes

Adding a new method at the end of a class without noticing operators above
Reorganizing methods and accidentally placing one after operators
Copy-pasting code blocks below the operator section
Adding a property at the end of a class, below its methods

How to fix it

Move the member up to where its kind belongs:

A method goes above every 'operator' and 'default operator' line (good.ek9 below)
A property goes above the methods
An explicit operator goes above a bare 'default operator', which stays the LAST line of the body (good_bare_default.ek9 below)

Examples

Every example is compiled by the EK9 compiler: the first fails exactly as captioned, the others fix it.

Fails with E01086: aggregate member out of order - EK9 requires: properties first, then methods, then operators (a bare 'default operator' last)

#!ek9
defines module error.e01086.bad

  defines class

    Product
      name <- String()
      price <- Float()

      default operator ?

      describe()
        <- rtn as String: `${name} at ${price}`

Fixed: Move the method up: properties, then methods, then operators

#!ek9
defines module error.e01086.good

  defines class

    Product
      name <- String()
      price <- Float()

      describe()
        <- rtn as String: `${name} at ${price}`

      default operator ?

Fixed: A bare 'default operator' is the last item: explicit operators go above it

#!ek9
defines module error.e01086.good.bare.default

  defines class

    Product
      name <- String()
      price <- Float()

      describe() as pure
        <- rtn as String: `${name} at ${price}`

      operator $ as pure
        <- rtn as String: describe()

      default operator

Questions and answers

These Q&A entries show E01086 and its fix: